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          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_BepoAgentWarrantsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">BEPO Agent Warrants [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_BepoAgentWarrantsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">BEPO Agent Warrants</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Income (Loss) from Continuing Operations before Income Taxes, Foreign</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Foreign</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ConcentrationRiskByTypeAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Concentration Risk Type [Axis]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ConcentrationRiskByTypeAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Concentration Risk Type [Axis]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FinanceLeaseLiability_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Finance Lease, Liability</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FinanceLeaseLiability_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Total finance lease liabilities</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_AtTheMarketOfferingMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">At-the-Market Offering</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_AtTheMarketOfferingMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">At-the-Market Offering [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_AtTheMarketOfferingMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Reserved for At-the-Market offering</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_SharesIssuedSharesShareBasedPaymentArrangementCapitalRaiseNetOfIssuanceCosts_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Shares issued, shares, share-based payment arrangement, capital raise, net of issuance costs.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_SharesIssuedSharesShareBasedPaymentArrangementCapitalRaiseNetOfIssuanceCosts_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Shares Issued, Shares, Share-Based Payment Arrangement, Capital Raise, Net of Issuance Costs</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_SharesIssuedSharesShareBasedPaymentArrangementCapitalRaiseNetOfIssuanceCosts_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Issuance of common stock and warrants in connection with capital raise, net of issuance costs (in shares)</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityIncorporationStateCountryCode_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Entity Incorporation, State or Country Code</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityIncorporationStateCountryCode_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Entity Incorporation, State or Country Code</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueGranted_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Share-Based Compensation Arrangement By Share-Based Payment Award, Equity Instruments Other Than Options, Aggregate Intrinsic Value, Granted</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueGranted_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Share-Based Compensation Arrangement By Share-Based Payment Award, Equity Instruments Other Than Options, Aggregate Intrinsic Value, Granted</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueGranted_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Granted</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FinanceLeaseLiabilityPaymentsDueYearFour_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">2029</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FinanceLeaseLiabilityPaymentsDueYearFour_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Finance Lease, Liability, to be Paid, Year Four</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PreferredStockSharesIssued_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Preferred Stock, Shares Issued</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PreferredStockSharesIssued_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Preferred stock, shares issued</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_GrossProceedsFormIssuanceOfCommonStock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Gross Proceeds form Issuance of Common Stock</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_GrossProceedsFormIssuanceOfCommonStock_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Gross proceeds form issuance of common stock.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_GrossProceedsFormIssuanceOfCommonStock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Gross proceeds from issuance of common stock</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_BalanceSheetLocationDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Statement of Financial Position Location, Balance [Domain]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability Value</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Fair value</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue_lbl" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel">Fair value, Ending Balance</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue_lbl" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel">Fair value, Beginning Balance</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_FutureLeasePaymentsExpected_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">future lease payments expected</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_FutureLeasePaymentsExpected_lbl" xlink:role="http://www.xbrl.org/2003/role/label">future lease payments expected</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_FutureLeasePaymentsExpected_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Future lease payments expected</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncreaseDecreaseInAccountsPayable_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Accounts payable</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncreaseDecreaseInAccountsPayable_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Increase (Decrease) in Accounts Payable</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncreaseDecreaseInAccountsPayable_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Increase (Decrease) in Accounts Payable, Total</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_RestatementAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Revision of Prior Period [Axis]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Supplemental disclosure of non-cash information</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LongTermDebtNoncurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Long-Term Debt, Excluding Current Maturities, Total</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LongTermDebtNoncurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Long-term debt - less current portion</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LongTermDebtNoncurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Long-term debt - less current portion</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_WarrantLiabilitiesFairValueDisclosure_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Warrant Liabilities, Fair Value Disclosure</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_WarrantLiabilitiesFairValueDisclosure_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Warrant Liabilities, Fair Value Disclosure</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_WarrantLiabilitiesFairValueDisclosure_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Warrant liabilities</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfDebtInstrumentsTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Schedule of Long-Term Debt Instruments [Table Text Block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfDebtInstrumentsTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Schedule of Debt</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PlanNameAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Plan Name [Axis]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PlanNameAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Plan Name [Axis]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EquityAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Equity [Abstract]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityCurrentReportingStatus_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Entity Current Reporting Status</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityCurrentReportingStatus_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Entity Current Reporting Status</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OperatingExpensesAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Operating Expenses [Abstract]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OperatingExpensesAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Operating expenses</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FairValueInputsLevel2Member_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Fair Value, Inputs, Level 2 [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FairValueInputsLevel2Member_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Level 2</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_RepaymentOfSecuredNotes_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Repayment of secured notes.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_RepaymentOfSecuredNotes_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Repayment of Secured Notes</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_RepaymentOfSecuredNotes_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Repayment of secured notes</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_RepaymentOfSecuredNotes_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Repayment of secured notes</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DeferredTaxAssetsNet_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Net deferred tax assets</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DeferredTaxAssetsNet_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Deferred Tax Assets, Net of Valuation Allowance</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePriceRollforward_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePriceRollforward_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Weighted-Average Exercise Price</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommitmentsAndContingenciesDisclosureTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Commitments and Contingencies Disclosure [Text Block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommitmentsAndContingenciesDisclosureTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Commitments and Contingencies</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommonStockSharesAuthorized_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Common Stock, Shares Authorized</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommonStockSharesAuthorized_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Common stock, shares authorized</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_Customer9Member_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Customer 9.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_Customer9Member_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Customer 9 [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_Customer9Member_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Customer 9</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_InvestmentPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Investments</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_InvestmentPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Investment, Policy [Policy Text Block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_ProductOrServiceAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Product and Service [Axis]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_ProductOrServiceAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Product and Service [Axis]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Fair Value by Liability Class [Domain]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Fair Value by Liability Class [Domain]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_RemainingContractualMaturitiesOfAFSInvestmentsTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Remaining contractual maturities of AFS investments</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_RemainingContractualMaturitiesOfAFSInvestmentsTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Remaining contractual maturities of AFS investments [Table Text Block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_RemainingContractualMaturitiesOfAFSInvestmentsTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Remaining contractual maturities of AFS investments</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_DocumentFiscalPeriodFocus_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Document Fiscal Period Focus</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_DocumentFiscalPeriodFocus_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Document Fiscal Period Focus</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OperatingLeaseRightOfUseAssetStatementOfFinancialPositionExtensibleList_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OperatingLeaseRightOfUseAssetStatementOfFinancialPositionExtensibleList_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FinanceLeaseLiabilityPaymentsDue_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Finance Lease, Liability, to be Paid</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FinanceLeaseLiabilityPaymentsDue_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Total Financing lease payments</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAccumulatedDepreciation_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Property, Plant, and Equipment, Lessor Asset under Operating Lease, Accumulated Depreciation</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAccumulatedDepreciation_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Accumulated Depreciation</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAccumulatedDepreciation_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Accumulated depreciation</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DebtInstrumentInterestRateStatedPercentage_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Debt Instrument, Interest Rate, Stated Percentage</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DebtInstrumentInterestRateStatedPercentage_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Secured notes bear interest rate</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DebtInstrumentInterestRateStatedPercentage_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Interest rate</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SalesTypeLeaseNetInvestmentInLeaseBeforeAllowanceForCreditLossCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Sales-Type Lease, Net Investment in Lease, before Allowance for Credit Loss, Current</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SalesTypeLeaseNetInvestmentInLeaseBeforeAllowanceForCreditLossCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Net investments in sales type lease</link:label>
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          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_ExchangeRatio_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Exchange Ratio</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_ExchangeRatio_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Exchange ratio</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_A2022PrivatePlacementWarrantsAndA2023PrivateWarrantBMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">A 2022 Private Placement Warrants and A 2023 Private Warrant B [Member]</link:label>
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          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityIssues_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Issuances</link:label>
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          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_WeightedAverageNumberOfSharesOutstandingDilutedDisclosureItemsAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Denominator:</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_WeightedAverageNumberOfSharesOutstandingDilutedDisclosureItemsAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Shares used in computing net loss per share:</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfMaturitiesOfLongTermDebtTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Schedule of Maturities of Long-Term Debt [Table Text Block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfMaturitiesOfLongTermDebtTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Schedule of Future Minimum Aggregate Payments</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OperatingLeaseImpairmentLoss_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Operating Lease, Impairment Loss</link:label>
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          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_NonCashWarrantIssuanceInConnectionWithAugustWarrantInducement_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Non-cash warrant issuance in connection with August warrant inducement.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_NonCashWarrantIssuanceInConnectionWithAugustWarrantInducement_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Non-cash warrant issuance in connection with August warrant inducement</link:label>
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          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_DilutiveSecuritiesEffectOfCommonStockUnits_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Common stock options</link:label>
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          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NotesPayableCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Notes Payable, Current, Total</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_EffectiveIncomeTaxRateReconciliationSectionThreeEightyTwoLimitationAmount_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Effective Income Tax Rate Reconciliation, Section Three Eighty Two Limitation, Amount</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_EffectiveIncomeTaxRateReconciliationSectionThreeEightyTwoLimitationAmount_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Effective Income Tax Rate Reconciliation, Section Three Eighty Two Limitation, Amount.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_EffectiveIncomeTaxRateReconciliationSectionThreeEightyTwoLimitationAmount_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Section 382 Limitation</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_PercentageOfCommonStockOutstanding_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Percentage Of Common Stock Outstanding</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_PercentageOfCommonStockOutstanding_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Percentage Of Common Stock Outstanding</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_PercentageOfCommonStockOutstanding_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Percentage of common stock outstanding</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PropertySubjectToOrAvailableForOperatingLeaseNet_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Property, Plant, and Equipment, Lessor Asset under Operating Lease, after Accumulated Depreciation</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PropertySubjectToOrAvailableForOperatingLeaseNet_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Total Equipment subject to operating lease, net</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="cyd_CybersecurityRiskManagementStrategyAndGovernanceAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Cybersecurity Risk Management, Strategy, and Governance [Abstract]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommonStockSharesIssued_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Common Stock, Shares, Issued</link:label>
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          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommonStockSharesIssued_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Common stock, sold</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="cyd_CybersecurityRiskManagementPositionsOrCommitteesResponsibleReportToBoardFlag_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Cybersecurity Risk Management Positions or Committees Responsible Report to Board [Flag]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_EffectiveIncomeTaxRateReconciliationResearchAndDevelopmentCreditsPercent_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Effective Income Tax Rate Reconciliation Research And Development credits Percent</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_EffectiveIncomeTaxRateReconciliationResearchAndDevelopmentCreditsPercent_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Effective income tax rate reconciliation research and development credits percent.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_EffectiveIncomeTaxRateReconciliationResearchAndDevelopmentCreditsPercent_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Research and development credits</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_EffectiveIncomeTaxRateReconciliationResearchAndDevelopmentCreditsPercent_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Research and development credits</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="cyd_CybersecurityRiskBoardOfDirectorsOversightTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Cybersecurity Risk Board of Directors Oversight [Text Block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_AtTheMarketOfferingCompanyMayOfferToSellJanuary312024Amendment_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">At-the-Market offering, Company may offer to sell, January 31, 2024 Amendment</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_AtTheMarketOfferingCompanyMayOfferToSellJanuary312024Amendment_lbl" xlink:role="http://www.xbrl.org/2003/role/label">At-the-Market offering, Company may offer to sell, January 31, 2024 Amendment</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_AtTheMarketOfferingCompanyMayOfferToSellJanuary312024Amendment_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">At-the-market offering, company may offer to sell, january 31, 2024 amendment</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StatementTable_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Statement [Table]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StatementTable_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Statement [Table]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_NonCurrentPrepaidExpensesAndOtherAssets_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Non-current prepaid expenses and other assets</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_NonCurrentPrepaidExpensesAndOtherAssets_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Non-current prepaid expenses and other assets</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_NonCurrentPrepaidExpensesAndOtherAssets_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Non-current prepaid expenses and other assets</link:label>
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          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Right-of-Use Asset Obtained in Exchange for Operating Lease Liability</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Operating lease right-of-use assets recorded in exchange for lease obligation</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardPurchasePriceOfCommonStockPercent_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Share-Based Compensation Arrangement by Share-Based Payment Award, Purchase Price of Common Stock, Percent</link:label>
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          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_AmericasMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Americas [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_AmericasMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Americas</link:label>
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          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_BusinessAcquisitionAcquireeDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Business Combination [Domain]</link:label>
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          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityFilerCategory_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Entity Filer Category</link:label>
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          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LongTermDebtCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Debt - current portion</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Long-Term Debt, Maturity, Year Three</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">2028</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PropertyPlantAndEquipmentByTypeAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Long-Lived Tangible Asset [Axis]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PropertyPlantAndEquipmentByTypeAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Long-Lived Tangible Asset [Axis]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FinanceLeaseLiabilityPaymentsDueYearThree_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Finance Lease, Liability, to be Paid, Year Three</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FinanceLeaseLiabilityPaymentsDueYearThree_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">2028</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DebtInstrumentFrequencyOfPeriodicPayment_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Debt Instrument, Frequency of Periodic Payment</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DebtInstrumentFrequencyOfPeriodicPayment_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Debt instrument, frequency of periodic payment</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_MomentusIncMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Momentus Inc [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_MomentusIncMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Momentus inc.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Decrease in valuation allowance</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Increase and decrease in valuation allowance</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="cyd_CybersecurityRiskThirdPartyOversightAndIdentificationProcessesFlag_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Cybersecurity Risk Third Party Oversight and Identification Processes [Flag]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_PercentageOfOriginalCostOfEquipmentElapsed_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Percentage Of Original Cost Of Equipment Elapsed</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_PercentageOfOriginalCostOfEquipmentElapsed_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Percentage of original cost of equipment elapsed.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_PercentageOfOriginalCostOfEquipmentElapsed_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Percentage of original cost of equipment elapsed</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CashAndCashEquivalentsFairValueDisclosure_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Cash and Cash Equivalents, Fair Value Disclosure</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CashAndCashEquivalentsFairValueDisclosure_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Money market funds</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DeferredTaxAssetsValuationAllowance_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Deferred Tax Assets, Valuation Allowance</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DeferredTaxAssetsValuationAllowance_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Valuation allowance</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Tax at federal statutory rate</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Tax at federal statutory rate</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel">Tax at federal statutory rate, Percentage</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SharesIssuedPricePerShare_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Shares Issued, Price Per Share</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SharesIssuedPricePerShare_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Shares issued, price per share</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SubsequentEventLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Subsequent Event [Line Items]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SubsequentEventLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Subsequent Event [Line Items]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_LongTermDebtExcludingConvertibleNotes_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Long-Term Debt, Excluding Convertible Notes</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_LongTermDebtExcludingConvertibleNotes_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Long-Term Debt, Excluding Convertible Notes</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_LongTermDebtExcludingConvertibleNotes_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Total</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="cyd_CybersecurityRiskManagementThirdPartyEngagedFlag_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Cybersecurity Risk Management Third Party Engaged [Flag]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_DocumentsIncorporatedByReferenceTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Documents Incorporated by Reference [Text Block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_DocumentsIncorporatedByReferenceTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Documents Incorporated by Reference</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_ServiceFees_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Service Fees</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_ServiceFees_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Service fees.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_ServiceFees_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Service fees</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EffectiveIncomeTaxRateContinuingOperations_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Effective Income Tax Rate Reconciliation, Percent</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EffectiveIncomeTaxRateContinuingOperations_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedTotalLabel">Total provision for income taxes</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EffectiveIncomeTaxRateContinuingOperations_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Total provision for income taxes</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EmployeeStockOptionMember_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Common stock options</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FinanceLeaseLiabilityCurrentStatementOfFinancialPositionExtensibleList_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Finance Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FinanceLeaseLiabilityCurrentStatementOfFinancialPositionExtensibleList_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Finance Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncomeTaxAuthorityAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Income Tax Jurisdiction [Axis]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_AtTheMarketOfferingLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/label">At the Market Offering [Line Items]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_AtTheMarketOfferingLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Line items represent At-the-Market Offering.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ProceedsFromConvertibleDebt_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Proceeds from Convertible Debt</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ProceedsFromConvertibleDebt_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Proceeds from secured convertible notes</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsNotSubjectToExpiration_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Deferred Tax Assets, Operating Loss Carryforwards, Not Subject to Expiration</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsNotSubjectToExpiration_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Net operating loss that can be carried forward indefinitely</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_SegmentGeographicalDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Geographical [Domain]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_SegmentGeographicalDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Geographical [Domain]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CashAndCashEquivalentsRestrictedCashAndCashEquivalentsPolicy_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Cash and Cash Equivalents, Restricted Cash and Cash Equivalents, Policy [Policy Text Block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CashAndCashEquivalentsRestrictedCashAndCashEquivalentsPolicy_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Cash and Cash Equivalents and Restricted Cash</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NetIncomeLossAvailableToCommonStockholdersBasicAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Net Income (Loss) Available to Common Stockholders, Basic [Abstract]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NetIncomeLossAvailableToCommonStockholdersBasicAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Numerator:</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_WarrantCancellationUponIssuanceOfCommonStock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Warrant Cancellation Upon Issuance of Common Stock</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_WarrantCancellationUponIssuanceOfCommonStock_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Warrant cancellation upon issuance of common stock.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_WarrantCancellationUponIssuanceOfCommonStock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Warrant cancellation upon issuance of common stock</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_EquipmentSubjectToOperatingLeaseMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Equipment subject to operating lease</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_EquipmentSubjectToOperatingLeaseMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Equipment Subject To Operating Lease [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_EquipmentSubjectToOperatingLeaseMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Equipment subject to operating lease.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_ContingentConsiderationLiabilityEarnoutPeriodThresholdConsecutiveTradingDays_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Threshold consecutive trading days</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_ContingentConsiderationLiabilityEarnoutPeriodThresholdConsecutiveTradingDays_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Contingent Consideration, Liability, Earnout Period, Threshold Consecutive Trading Days</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_ContingentConsiderationLiabilityEarnoutPeriodThresholdConsecutiveTradingDays_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Contingent Consideration, Liability, Earnout Period, Threshold Consecutive Trading Days</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Employer contribution, percentage of employee's eligible compensation</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfErrorCorrectionsAndPriorPeriodAdjustmentsTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Schedule of Error Corrections and Prior Period Adjustments [Table Text Block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfErrorCorrectionsAndPriorPeriodAdjustmentsTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Summary of Revisions to Previously Issued Financial Statements</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_RepaymentOfLongTermDebtExcludingConvertibleDebt_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">repayment Of Long-Term Debt, Excluding Convertible Debt</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_RepaymentOfLongTermDebtExcludingConvertibleDebt_lbl" xlink:role="http://www.xbrl.org/2003/role/label">repayment Of Long-Term Debt, Excluding Convertible Debt</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_RepaymentOfLongTermDebtExcludingConvertibleDebt_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Repayment of equipment loan</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_CancellationOfPrincipalAmount_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Cancellation of principal amount.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_CancellationOfPrincipalAmount_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Cancellation Of Principal Amount</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_CancellationOfPrincipalAmount_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Cancellation of principal amount</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfInventoryCurrentTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Schedule of Inventory, Current [Table Text Block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfInventoryCurrentTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Schedule of Inventories</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_CustomerLiabilitiesPrepaidReserveCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Customer liabilities - prepaid reserve</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_CustomerLiabilitiesPrepaidReserveCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Customer Liabilities Prepaid Reserve Current</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_CustomerLiabilitiesPrepaidReserveCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Customer liabilities prepaid reserve current.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DeferredFinanceCostsNet_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Debt Issuance Costs, Net</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DeferredFinanceCostsNet_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Deferred finance costs</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DeferredFinanceCostsNet_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Debt Issuance Costs, Net, Total</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DeferredFinanceCostsNet_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel">Deferred financing costs</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DebtInstrumentInterestRateDuringPeriod_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Debt Instrument, Interest Rate During Period</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DebtInstrumentInterestRateDuringPeriod_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Effective interest rate during period (as a percent)</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SignificantAccountingPoliciesTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Significant Accounting Policies [Text Block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SignificantAccountingPoliciesTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Summary of Significant Accounting Policies</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PropertyPlantAndEquipmentLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Property, Plant and Equipment [Line Items]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PropertyPlantAndEquipmentLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Property, Plant and Equipment [Line Items]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_MeasurementInputRiskFreeInterestRateMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Measurement Input, Risk Free Interest Rate [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_MeasurementInputRiskFreeInterestRateMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Risk-free interest rate</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_MeasurementInputRiskFreeInterestRateMember_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Risk-free interest rate</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ConcentrationRiskTable_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Concentration Risk [Table]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ConcentrationRiskTable_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Concentration Risk [Table]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_NoticeOfDelistingPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Notice of Delisting</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_NoticeOfDelistingPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Notice of Delisting [Policy Text Block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_NoticeOfDelistingPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Notice of Delisting</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_LesseeFinancingLeaseLiabilityUndiscountedExcessAmount_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Less portion representing imputed interest</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_LesseeFinancingLeaseLiabilityUndiscountedExcessAmount_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Lessee, Financing Lease, Liability, Undiscounted Excess Amount</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_LesseeFinancingLeaseLiabilityUndiscountedExcessAmount_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Lessee, financing lease, liability, undiscounted excess amount.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_LesseeFinancingLeaseLiabilityUndiscountedExcessAmount_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Less portion representing imputed interest</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_VestingDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Vesting [Domain]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Granted (in shares)</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_PlacementAgentWarrantsExercisePrice_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Placement Agent Warrants, Exercise Price</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_PlacementAgentWarrantsExercisePrice_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Placement Agent Warrants, Exercise Price</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_PlacementAgentWarrantsExercisePrice_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Placement Agent Warrants, Exercise Price</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DisaggregationOfRevenueTable_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Disaggregation of Revenue [Table]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DisaggregationOfRevenueTable_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Disaggregation of Revenue [Table]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="cyd_CybersecurityRiskManagementStrategyAndGovernanceTable_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Cybersecurity Risk Management, Strategy, and Governance [Table]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfEarningsPerShareBasicAndDilutedTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfEarningsPerShareBasicAndDilutedTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Computation of Basic and Diluted Net Loss Per Share</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_Customer3Member_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Customer 3</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_Customer3Member_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Customer 3 [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_Customer3Member_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Customer 3</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StockCompensationPlanMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Share-Based Payment Arrangement [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StockCompensationPlanMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Shares available for future grant under 2021 Equity Incentive Plan</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EarningsPerShareBasic_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Basic (in dollars per share)</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EarningsPerShareBasic_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Earnings Per Share, Basic, Total</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EarningsPerShareBasic_lbl" xlink:role="http://www.xbrl.org/2009/role/netLabel">Basic (in shares)</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EarningsPerShareBasic_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Net income (loss) per share basic</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EarningsPerShareBasic_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Net income (loss) per share basic</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PensionAndOtherPostretirementBenefitsDisclosureTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Retirement Benefits [Text Block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PensionAndOtherPostretirementBenefitsDisclosureTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Employee Defined-Contribution Plans</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_lbl" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel">Outstanding as of end of period (in shares)</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_lbl" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel">Outstanding as of beginning of period (in shares)</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Outstanding as of beginning of period (in shares)</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_SecuredNotesAccruedAndUnpaidInterest_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Secured Notes, accrued and unpaid interest</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_SecuredNotesAccruedAndUnpaidInterest_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Secured Notes, accrued and unpaid interest</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_SecuredNotesAccruedAndUnpaidInterest_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Secured notes, accrued and unpaid interest</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OperatingLeaseLeaseIncome_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Operating Lease, Lease Income</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OperatingLeaseLeaseIncome_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Recurring Payment</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OperatingLeaseLeaseIncome_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Operating Lease, Lease Income, Total</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ImpairmentOfLeasehold_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Impairment of Leasehold</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ImpairmentOfLeasehold_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Impairment of equipment subject to operating lease</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LiabilitiesCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Liabilities, Current</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LiabilitiesCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Total current liabilities</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LiabilitiesCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Total current liabilities</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_LesseeLeaseLiabilityToBePaidYearThree_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Lessee, Lease, Liability, To Be Paid, Year Three</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_LesseeLeaseLiabilityToBePaidYearThree_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Lessee, Lease, Liability, To Be Paid, Year Three</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_LesseeLeaseLiabilityToBePaidYearThree_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">2028</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncreaseDecreaseInAccountsReceivable_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Increase (Decrease) in Accounts Receivable</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncreaseDecreaseInAccountsReceivable_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Accounts receivable</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Summary of Changes in Fair Value of Level 3 Financial Instruments</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_PaymentsForIssuanceCostRelatedToTheBEPOOffering_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Payments for Issuance Cost Related to the B E P O Offering</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_PaymentsForIssuanceCostRelatedToTheBEPOOffering_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Payments for Issuance Cost Related to the B E P O Offering</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_PaymentsForIssuanceCostRelatedToTheBEPOOffering_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Payments for issuance cost related to the BEPO Offering</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_InventoryFinishedGoodsNetOfReserves_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Inventory, Finished Goods, Net of Reserves</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_InventoryFinishedGoodsNetOfReserves_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Finished goods</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DomesticCountryMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Federal</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DomesticCountryMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Domestic Tax Jurisdiction [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Proceeds from Sale and Maturity of Debt Securities, Available-for-Sale</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Proceeds from maturity of available for sale investments</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EffectiveIncomeTaxRateReconciliationTable_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Effective Income Tax Rate Reconciliation [Table]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AdjustmentsForNewAccountingPronouncementsAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Accounting Standards Update [Axis]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_July2024PrivateWarrantsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">July 2024 private warrants.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_July2024PrivateWarrantsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">July 2024 Private Warrants [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_July2024PrivateWarrantsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">July 2024 Private Warrants</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StockholdersEquityAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Equity, Attributable to Parent [Abstract]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StockholdersEquityAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Stockholders&#8217; equity:</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_Customer5Member_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Customer 5</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_Customer5Member_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Customer 5 [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_Customer5Member_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Customer 5</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntitySmallBusiness_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Entity Small Business</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntitySmallBusiness_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Entity Small Business</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_FairValueOfCustomerLiabilityMeasurementInputTerm_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Fair Value of Customer Liability Measurement Input Term</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_FairValueOfCustomerLiabilityMeasurementInputTerm_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Fair value of customer liability measurement input term.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_FairValueOfCustomerLiabilityMeasurementInputTerm_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Expected Term (years)</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RetainedEarningsAccumulatedDeficit_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Retained Earnings (Accumulated Deficit)</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RetainedEarningsAccumulatedDeficit_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Accumulated deficit</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RetainedEarningsAccumulatedDeficit_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Retained Earnings (Accumulated Deficit), Total</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RetainedEarningsAccumulatedDeficit_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Accumulated deficit</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Share-Based Compensation Cost</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Stock based compensation</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityWellKnownSeasonedIssuer_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Entity Well-known Seasoned Issuer</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityWellKnownSeasonedIssuer_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Entity Well-known Seasoned Issuer</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SaleOfStockPricePerShare_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Sale of stock, price per share</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SaleOfStockPricePerShare_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Sale of Stock, Price Per Share</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period, Intrinsic Value</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Aggregate intrinsic value of options exercised</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CurrentForeignTaxExpenseBenefit_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Current Foreign Tax Expense (Benefit)</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CurrentForeignTaxExpenseBenefit_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Foreign</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_WarrantsAndRightsOutstandingMeasurementInput_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Warrants and Rights Outstanding, Measurement Input</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_WarrantsAndRightsOutstandingMeasurementInput_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Warrant, measurement input</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Share-Based Payment Arrangement [Text Block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Equity Incentive Plans and Stock-Based Compensation</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Organization, Consolidation and Presentation of Financial Statements [Abstract]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LeasesAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Leases [Abstract]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommonClassAMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Common Class A [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommonClassAMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Class A</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_WarrantExpirationPeriod_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Warrant expiration period</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_WarrantExpirationPeriod_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Warrant Expiration Period</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_WarrantExpirationPeriod_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Warrant expiration period</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_InventoryValuationReserves_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Inventory reserve</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_InventoryValuationReserves_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Inventory Valuation Reserves</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_InventoryValuationReserves_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Inventory reserve</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_AmendmentFlag_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Amendment Flag</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_AmendmentFlag_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Amendment Flag</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_ProductsAndServicesDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Product and Service [Domain]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_ProductsAndServicesDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Product and Service [Domain]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Tax at federal statutory rate</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_ChiefExecutiveOfficerMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Chief Executive Officer [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_ChiefExecutiveOfficerMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Chief Executive Officer</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EarningsPerSharePolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Earnings Per Share, Policy [Policy Text Block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EarningsPerSharePolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Net Income (Loss) per Share</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ConcentrationRiskLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Concentration Risk [Line Items]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ConcentrationRiskLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Concentration Risk [Line Items]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_DebtDerivativeMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Debt Derivative</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_DebtDerivativeMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Debt Derivative [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_DebtDerivativeMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Debt Derivative</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LiabilitiesAndStockholdersEquityAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Liabilities and Equity [Abstract]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LiabilitiesAndStockholdersEquityAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Liabilities and Stockholders&#8217; Equity</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityAddressPostalZipCode_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Entity Address, Postal Zip Code</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityAddressPostalZipCode_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Entity Address, Postal Zip Code</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_TradeAndOtherAccountsReceivablePolicy_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Accounts Receivable, Net</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_TradeAndOtherAccountsReceivablePolicy_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Accounts Receivable [Policy Text Block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NetCashProvidedByUsedInOperatingActivities_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Cash Provided by (Used in) Operating Activity, Including Discontinued Operation</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NetCashProvidedByUsedInOperatingActivities_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Net cash used in operating activities</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NetCashProvidedByUsedInOperatingActivities_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Net cash used in operating activities</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_LeasePayments_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Lease, Payments</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_LeasePayments_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Lease, Payments</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_LeasePayments_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Cash paid for leases</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommonStockMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Common Stock [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommonStockMember_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Common stock, par value $0.00001 per share</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommonStockMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Common Stock</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="cyd_CybersecurityRiskRoleOfManagementTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Cybersecurity Risk Role of Management [Text Block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_TaxCreditCarryforwardAmount_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Tax Credit Carryforward, Amount</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_TaxCreditCarryforwardAmount_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Tax credit carryforward</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Long-Term Debt, Maturity, Year One</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">2026</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Granted (in dollars per share)</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Lessee, Operating Lease, Liability, to be Paid, Year Three</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">2028</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel">Less accumulated depreciation and amortization</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_BusinessCombinationContingentConsiderationArrangementsGainLossOnFairValueLiability_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Business Combination, Contingent Consideration Arrangements, Gain (Loss) On Fair Value, Liability</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_BusinessCombinationContingentConsiderationArrangementsGainLossOnFairValueLiability_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Business Combination, Contingent Consideration Arrangements, Gain (Loss) On Fair Value, Liability</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_BusinessCombinationContingentConsiderationArrangementsGainLossOnFairValueLiability_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Change in fair value of contingent earnout liabilities</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Debt Securities, Available-for-Sale [Line Items]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Debt Securities, Available-for-sale [Line Items]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ContractWithCustomerAssetCreditLossExpense_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Contract with Customer, Asset, Credit Loss Expense (Reversal)</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ContractWithCustomerAssetCreditLossExpense_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Provision for credit loss related to contract assets</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_BusinessCombinationContingentConsiderationLiabilityMeasurementInput_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Business Combination, Contingent Consideration, Liability, Measurement Input</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_BusinessCombinationContingentConsiderationLiabilityMeasurementInput_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Business combination, measurement input</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_A2023PrivateWarrantAMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">2023 Private Warrant A</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_A2023PrivateWarrantAMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">2023 Private Warrant A [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_A2023PrivateWarrantAMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">2023 Private Warrant A [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityAddressAddressLine1_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Entity Address, Address Line One</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityAddressAddressLine1_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Entity Address, Address Line One</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DeferredIncomeTaxLiabilities_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedTotalLabel">Total deferred tax liabilities</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DeferredIncomeTaxLiabilities_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Deferred Tax Liabilities, Gross</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_LongTermDebtCurrentMaturitiesExcludingConvertibleNotes_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Debt current portion</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_LongTermDebtCurrentMaturitiesExcludingConvertibleNotes_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Long-Term Debt, Current Maturities, Excluding Convertible Notes</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_LongTermDebtCurrentMaturitiesExcludingConvertibleNotes_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Long-Term Debt, Current Maturities, Excluding Convertible Notes</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_LongTermDebtCurrentMaturitiesExcludingConvertibleNotes_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Long-term debt, current maturities, excluding convertible notes</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FairValueByFairValueHierarchyLevelAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Fair Value Hierarchy and NAV [Axis]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FairValueByFairValueHierarchyLevelAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Fair Value Hierarchy and NAV [Axis]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_ContingentEarnoutLiabilityMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Contingent Earnout Liability</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_ContingentEarnoutLiabilityMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Contingent Earnout Liability [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_ContingentEarnoutLiabilityMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Contingent Earnout Liability [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EarningsPerShareAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Earnings Per Share [Abstract]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EarningsPerShareAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Net income (loss) per share:</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncomeTaxPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Income Tax, Policy [Policy Text Block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncomeTaxPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Income Taxes</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_ATMSalesAgreementMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">ATM Sales Agreement</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_ATMSalesAgreementMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">ATM Sales Agreement [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_ATMSalesAgreementMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">ATM Sales Agreement</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="cyd_CybersecurityRiskMateriallyAffectedOrReasonablyLikelyToMateriallyAffectRegistrantFlag_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Cybersecurity Risk Materially Affected or Reasonably Likely to Materially Affect Registrant [Flag]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SupplementalCashFlowInformationAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Supplemental Cash Flow Information [Abstract]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SupplementalCashFlowInformationAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Supplemental disclosure of cash flow information</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_SaleOfStockAdditionalNumberOfSharesIssued_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Sale of stock, additional number of shares issued</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_SaleOfStockAdditionalNumberOfSharesIssued_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Sale Of Stock Additional Number Of Shares Issued</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_SaleOfStockAdditionalNumberOfSharesIssued_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Sale of stock, additional number of shares issued.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FinanceLeaseRightOfUseAssetBeforeAccumulatedAmortization_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Finance Lease, Right-of-Use Asset, before Accumulated Amortization</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FinanceLeaseRightOfUseAssetBeforeAccumulatedAmortization_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Equipment leased to customers, cost basis</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_BalanceSheetLocationAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Statement of Financial Position Location, Balance [Axis]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OperatingLeaseRightOfUseAsset_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Operating Lease, Right-of-Use Asset</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OperatingLeaseRightOfUseAsset_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Right of use assets</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DeferredTaxAssetsGross_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Total deferred tax assets</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DeferredTaxAssetsGross_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Deferred Tax Assets, Gross</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DeferredTaxAssetsGross_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Gross impact to deferred tax asset</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="cyd_CybersecurityRiskBoardCommitteeOrSubcommitteeResponsibleForOversightTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Cybersecurity Risk Board Committee or Subcommittee Responsible for Oversight [Text Block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_AccruedExpensesAndOtherCurrentLiabilitiesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Accrued Expenses And Other Current Liabilities [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_AccruedExpensesAndOtherCurrentLiabilitiesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Accrued expenses and other current liabilities.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_AccruedExpensesAndOtherCurrentLiabilitiesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Accrued Expenses and Other Current Liabilities [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ClassOfWarrantOrRightAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Class of Warrant or Right [Axis]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ClassOfWarrantOrRightAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Class of Warrant or Right [Axis]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_DocumentType_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Document Type</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_DocumentType_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Document Type</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_GrossProfit_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Gross Profit</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_GrossProfit_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Gross Profit</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_GrossProfit_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Gross loss</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_TypeOfArrangementAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Collaborative Arrangement and Arrangement Other than Collaborative [Axis]</link:label>
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          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_ShareBasedPaymentArrangementExpensedAndCapitalizedIncludedInCostOfRevenueAmountTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Share-Based Payment Arrangement, Expensed and Capitalized, Included in Cost of Revenue, Amount [Table Text Block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_ShareBasedPaymentArrangementExpensedAndCapitalizedIncludedInCostOfRevenueAmountTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Share-Based Payment Arrangement, Expensed and Capitalized, Included in Cost of Revenue, Amount</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_ClassOfWarrantOrRightFairValueOfWarrantsOrRightsAtIssuance_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Class Of Warrant Or Right, Fair Value Of Warrants Or Rights At Issuance</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_ClassOfWarrantOrRightFairValueOfWarrantsOrRightsAtIssuance_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Class Of Warrant Or Right, Fair Value Of Warrants Or Rights At Issuance</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_ClassOfWarrantOrRightFairValueOfWarrantsOrRightsAtIssuance_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Fair Value on Issue Date per warrant (in dollars per warrant)</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StockIssuedDuringPeriodSharesPeriodIncreaseDecrease_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Stock Issued During Period, Shares, Period Increase (Decrease)</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StockIssuedDuringPeriodSharesPeriodIncreaseDecrease_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Additional shares</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ArrangementsAndNonarrangementTransactionsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Collaborative Arrangement and Arrangement Other than Collaborative [Domain]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityCentralIndexKey_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Entity Central Index Key</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityCentralIndexKey_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Entity Central Index Key</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Accounts Receivable, Allowance for Credit Loss, Current</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel">Less: Allowances for credit losses</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DebtSecuritiesAvailableForSaleTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Debt Securities, Available-for-Sale [Table Text Block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DebtSecuritiesAvailableForSaleTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Summary of Available-for-Sale Investments</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_NewLeases_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">New Leases</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_NewLeases_lbl" xlink:role="http://www.xbrl.org/2003/role/label">New Leases</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_NewLeases_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">New leases</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_InvestmentsDebtAndEquitySecuritiesAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Investments, Debt and Equity Securities [Abstract]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="cyd_CybersecurityRiskProcessForInformingBoardCommitteeOrSubcommitteeResponsibleForOversightTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Cybersecurity Risk Process for Informing Board Committee or Subcommittee Responsible for Oversight [Text Block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_FebruaryTwoThousandAndTwentyFiveSecuritiesPurchaseAgreementMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">February 2025 Securities Purchase Agreement</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_FebruaryTwoThousandAndTwentyFiveSecuritiesPurchaseAgreementMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">February Two Thousand and Twenty Five Securities Purchase Agreement [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_FebruaryTwoThousandAndTwentyFiveSecuritiesPurchaseAgreementMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">February two thousand and twenty five securities purchase agreement.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_ContingentEarnoutLiabilityScenarioTwoMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Contingent Earnout Liability, Scenario Two</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_ContingentEarnoutLiabilityScenarioTwoMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Contingent Earnout Liability, Scenario Two [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_ContingentEarnoutLiabilityScenarioTwoMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Contingent Earnout Liability, Scenario Two</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Including Exchange Rate Effect and Discontinued Operation</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Net change in cash and cash equivalents</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SubsequentEventTypeDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Subsequent Event Type [Domain]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SubsequentEventTypeDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Subsequent Event Type [Domain]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FairValueAdjustmentOfWarrants_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Fair Value Adjustment of Warrants</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FairValueAdjustmentOfWarrants_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Gain on fair value of warrants</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FairValueAdjustmentOfWarrants_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Change in fair value of warrants</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FairValueAdjustmentOfWarrants_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Change in fair value of warrants</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Total potentially dilutive common share equivalents (in shares)</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_AtTheMarketOfferingTable_lbl" xlink:role="http://www.xbrl.org/2003/role/label">At The Market Offering [Table]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_AtTheMarketOfferingTable_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Disclosure of information about At-the-Market Offering.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_ThirdNewSecuredNoteMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Third New Notes</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_ThirdNewSecuredNoteMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Third New Secured Note [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_ThirdNewSecuredNoteMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Third new secured note.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommonStockParOrStatedValuePerShare_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Common Stock, Par or Stated Value Per Share</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommonStockParOrStatedValuePerShare_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Common stock, par value (in dollars per share)</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommonStockParOrStatedValuePerShare_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Common stock, par value</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_TypeOfAdoptionMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Accounting Standards Update [Domain]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Other comprehensive loss</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_RevenueFromLicensingAgreementsInstallationAndTrainingAndOtherServices_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Revenue From Licensing Agreements, Installation and Training and Other Services</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_RevenueFromLicensingAgreementsInstallationAndTrainingAndOtherServices_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Revenue From Licensing Agreements Installation And Training And Other Services</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_RevenueFromLicensingAgreementsInstallationAndTrainingAndOtherServices_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Revenue from licensing agreements, installation and training and other services.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_PlacementAgencyAgreementCertainExpensesReimbursedAmount_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Placement agency agreement certain expenses reimbursed amount.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_PlacementAgencyAgreementCertainExpensesReimbursedAmount_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Placement Agency Agreement Certain Expenses Reimbursed Amount</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_PlacementAgencyAgreementCertainExpensesReimbursedAmount_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Placement agency agreement, certain expenses, reimbursed amount</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationAwardTrancheOneMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Tranche One</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationAwardTrancheOneMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Share-Based Payment Arrangement, Tranche One [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OperatingLeaseRightOfUseAssetAmortizationExpense_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Operating Lease, Right-of-Use Asset, Periodic Reduction</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OperatingLeaseRightOfUseAssetAmortizationExpense_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Non-cash lease expense</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Weighted-Average Remaining Contractual Term in years</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_DilutiveSecuritiesEffectOfRestrictedStockUnits_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Dilutive Securities, Effect of Restricted Stock Units</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_DilutiveSecuritiesEffectOfRestrictedStockUnits_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Dilutive Securities, Effect of Restricted Stock Units</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_DilutiveSecuritiesEffectOfRestrictedStockUnits_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Restricted stock units</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AvailableForSaleSecuritiesDebtSecurities_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Debt Securities, Available-for-Sale</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AvailableForSaleSecuritiesDebtSecurities_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Fair Value</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AvailableForSaleSecuritiesDebtSecurities_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Debt Securities, Available-for-Sale, Total</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AvailableForSaleSecuritiesDebtSecurities_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Available-for-sale investments</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_A2024PrivateWarrantsLiabilityMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">A 2024 Private Warrants Liability.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_A2024PrivateWarrantsLiabilityMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">A 2024 Private Warrants Liability [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_A2024PrivateWarrantsLiabilityMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">2024 Private Warrants liability [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_DocumentFinStmtErrorCorrectionFlag_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Document Financial Statement Error Correction [Flag]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_DocumentFinStmtErrorCorrectionFlag_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Document Financial Statement Error Correction [Flag]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Exercised (in shares)</link:label>
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          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedNumberOfShares_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Unvested options</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedNumberOfShares_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Nonvested, Number of Shares</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedNumberOfShares_lbl" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel">Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Nonvested, Number of Shares, Ending Balance</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedNumberOfShares_lbl" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel">Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Nonvested, Number of Shares, Beginning Balance</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DebtDisclosureAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Debt Disclosure [Abstract]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_PropertyPlantAndEquipmentUsefulLifeTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Property, Plant and Equipment Useful Life [Table Text Block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_PropertyPlantAndEquipmentUsefulLifeTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Property, plant and equipment useful life.</link:label>
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          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_ServiceAgreementTerm_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Service Agreement Term</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_ServiceAgreementTerm_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Service agreement term.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_ServiceAgreementTerm_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Service agreement term</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_A2023PrivatePlacementWarrantsBMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">2023 Private Placement Warrants B</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_A2023PrivatePlacementWarrantsBMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">2023 Private Placement Warrants B [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_A2023PrivatePlacementWarrantsBMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">2023 Private Placement Warrants B</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CostOfSalesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Stock-based compensation recorded in cost of revenue</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CostOfSalesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Cost of Sales [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_OwnershipDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Ownership [Domain]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_CurrentFiscalYearEndDate_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Current Fiscal Year End Date</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_CurrentFiscalYearEndDate_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Current Fiscal Year End Date</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DebtInstrumentTable_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Schedule of Long-Term Debt Instruments [Table]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DebtInstrumentTable_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Schedule of Long-term Debt Instruments [Table]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_SecuredNotesAccretingDiscounts_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Secured Notes, Accreting Discounts</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_SecuredNotesAccretingDiscounts_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Secured Notes, Accreting Discounts</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_SecuredNotesAccretingDiscounts_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Secured notes, accreting discounts</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_ScheduleOfAccruedAndOtherCurrentLiabilitiesTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Schedule Of Accrued And Other Current Liabilities</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_ScheduleOfAccruedAndOtherCurrentLiabilitiesTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Schedule Of Accrued And Other Current Liabilities [Table Text Block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_ScheduleOfAccruedAndOtherCurrentLiabilitiesTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Schedule Of Accrued And Other Current Liabilities</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherNoncurrentLiabilitiesTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Other Noncurrent Liabilities [Table Text Block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherNoncurrentLiabilitiesTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Schedule of Other Noncurrent Liabilities</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_ChangeInFairValueOfContingentEarnoutLiabilities_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Change in Fair Value of Contingent Earnout Liabilities</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_ChangeInFairValueOfContingentEarnoutLiabilities_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Change in fair value of contingent earnout liabilities.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_ChangeInFairValueOfContingentEarnoutLiabilities_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Change in fair value of contingent earnout liabilities</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_DocumentQuarterlyReport_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Document Quarterly Report</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_DocumentQuarterlyReport_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Document Quarterly Report</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="stpr_CA_lbl" xlink:role="http://www.xbrl.org/2003/role/label">CALIFORNIA</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="stpr_CA_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">California</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_A2022PrivatePlacementWarrantsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">2022 Private Placement Warrants</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_A2022PrivatePlacementWarrantsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">2022 Private Placement Warrants [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_A2022PrivatePlacementWarrantsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">2022 Private Placement Warrants</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_A2022PrivatePlacementWarrantsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">2022 Private Placement Warrants [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_TotalLeaseLiabilities_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Total lease liabilities</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_TotalLeaseLiabilities_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Total lease liabilities.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_TotalLeaseLiabilities_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Total financing lease liabilities</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FairValueByBalanceSheetGroupingTable_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Fair Value, by Balance Sheet Grouping [Table]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FairValueByBalanceSheetGroupingTable_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Fair Value, by Balance Sheet Grouping [Table]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_WarrantsAndRightsOutstandingIssueDate_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Warrants and rights outstanding issue date.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_WarrantsAndRightsOutstandingIssueDate_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Warrants And Rights Outstanding Issue Date</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_WarrantsAndRightsOutstandingIssueDate_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Issue Date</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_AugustInducementWarrantsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">August inducement warrants.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_AugustInducementWarrantsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">August Inducement Warrants [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_AugustInducementWarrantsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">August Inducement Warrants</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityAddressStateOrProvince_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Entity Address, State or Province</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityAddressStateOrProvince_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Entity Address, State or Province</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_AtTheMarketOfferingFixedCommissionRate_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">At-the-Market offering, fixed commission rate</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_AtTheMarketOfferingFixedCommissionRate_lbl" xlink:role="http://www.xbrl.org/2003/role/label">At-the-Market offering, fixed commission rate</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_AtTheMarketOfferingFixedCommissionRate_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">At-the-Market offering, fixed commission rate</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_lbl" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel">Balance as of end of period (in shares)</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_lbl" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel">Balance as of beginning of period (in shares)</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Unvested RSUs</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FinancialLiabilitiesFairValueDisclosure_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Financial Liabilities Fair Value Disclosure</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FinancialLiabilitiesFairValueDisclosure_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Total financial liabilities</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PreferredStockSharesOutstanding_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Preferred Stock, Shares Outstanding</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PreferredStockSharesOutstanding_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Preferred stock, shares outstanding</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ComprehensiveIncomeNetOfTax_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Comprehensive Income (Loss), Net of Tax, Attributable to Parent</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ComprehensiveIncomeNetOfTax_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Total comprehensive loss</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ComprehensiveIncomeNetOfTax_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Total comprehensive income (loss)</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommonStockCapitalSharesReservedForFutureIssuance_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Common Stock, Capital Shares Reserved for Future Issuance</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommonStockCapitalSharesReservedForFutureIssuance_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Number of shares of common stock reserved for issuance (in shares)</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommonStockCapitalSharesReservedForFutureIssuance_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Shares of common stock reserved (in shares)</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ClassOfWarrantOrRightDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Class of Warrant or Right [Domain]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ClassOfWarrantOrRightDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Class of Warrant or Right [Domain]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_A2023PrivatePlacementWarrantsAMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">2023 Private Placement Warrants A</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_A2023PrivatePlacementWarrantsAMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">2023 Private Placement Warrants A [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_A2023PrivatePlacementWarrantsAMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">2023 Private Placement Warrants A</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_StatementGeographicalAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Geographical [Axis]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_StatementGeographicalAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Geographical [Axis]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ContractWithCustomerLiabilityRevenueRecognized_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Contract with Customer, Liability, Revenue Recognized</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ContractWithCustomerLiabilityRevenueRecognized_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Revenue recognized included in contract liabilities</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ConversionOfStockSharesConverted1_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Conversion of Stock, Shares Converted</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ConversionOfStockSharesConverted1_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Conversion of stock, shares converted</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AccountsReceivableMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Accounts Receivable [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AccountsReceivableMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Accounts Receivable, Net</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_NumberOfConsecutiveTradingDays_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Number of consecutive trading days.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_NumberOfConsecutiveTradingDays_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Number of Consecutive Trading Days</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_NumberOfConsecutiveTradingDays_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Number of consecutive trading days</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_EarningsPerShareBasicAndDilutedEPSAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Earnings Per Share, Basic And Diluted EPS</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_EarningsPerShareBasicAndDilutedEPSAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Earnings Per Share, Basic And Diluted EPS [Abstract]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_EarningsPerShareBasicAndDilutedEPSAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Net income (loss) per share</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_ContingentEarnoutLiabilityScenarioDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Contingent Earnout Liability, Scenario [Domain]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_ContingentEarnoutLiabilityScenarioDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Contingent Earnout Liability, Scenario [Domain]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_ContingentEarnoutLiabilityScenarioDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Contingent Earnout Liability, Scenario [Domain]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_PercentageOfRevenueWithRecurringPaymentTransactions_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Percentage Of Revenue With Recurring Payment Transactions</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_PercentageOfRevenueWithRecurringPaymentTransactions_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Percentage of revenue with recurring payment transactions.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_PercentageOfRevenueWithRecurringPaymentTransactions_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Percentage of revenue with recurring payment transactions</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_DilutiveSecuritiesEffectOfCommonStockWarrants_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Dilutive Securities, Effect of Common Stock Warrants</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_DilutiveSecuritiesEffectOfCommonStockWarrants_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Dilutive Securities, Effect of Common Stock Warrants</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_DilutiveSecuritiesEffectOfCommonStockWarrants_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Common stock warrants</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">State, net of federal benefit</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LicenseMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">License [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LicenseMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Licensing</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Schedule of Stock-Based Compensation Expense</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Stock Issued During Period, Value, Stock Options Exercised</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Issuance of common stock upon exercise of stock options</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ComprehensiveIncomePolicyPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Comprehensive Income, Policy [Policy Text Block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ComprehensiveIncomePolicyPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Comprehensive Income (Loss)</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_LesseeLeaseLiabilityToBePaidYearTwo_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Lessee, Lease, Liability, To Be Paid, Year Two</link:label>
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          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_LesseeLeaseLiabilityToBePaidYearTwo_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">2027</link:label>
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          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfDeferredTaxAssetsAndLiabilitiesTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Components of Deferred Tax Assets and Liabilities</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_A2024PrivateWarrantAMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">2024 private warrant A.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_A2024PrivateWarrantAMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">A 2024 Private Warrant A [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_A2024PrivateWarrantAMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">2024 Private Warrant A [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_A2024PrivateWarrantAMember_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">BEPO Warrants [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_ContingentConsiderationLiabilityEarnoutPeriodThresholdTradingDays_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Contingent Consideration, Liability, Earnout Period, Threshold Trading Days</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_ContingentConsiderationLiabilityEarnoutPeriodThresholdTradingDays_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Contingent Consideration, Liability, Earnout Period, Threshold Trading Days</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_ContingentConsiderationLiabilityEarnoutPeriodThresholdTradingDays_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Threshold trading days</link:label>
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          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SubsequentEventMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Subsequent Event</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_FebruaryNoteSecondTrancheMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">February Note Second Tranche [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_FebruaryNoteSecondTrancheMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">February note second tranche member.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_FebruaryNoteSecondTrancheMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">February Note 2nd Tranche</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsResearch_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Research and development tax credits</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsResearch_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Deferred Tax Assets, Tax Credit Carryforwards, Research</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_LegacyVelo3DMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Legacy Velo3D.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_LegacyVelo3DMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Legacy Velo3D [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_LegacyVelo3DMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Legacy Velo3D</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherAssetsNoncurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Other Assets, Noncurrent</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherAssetsNoncurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Other assets</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherAssetsNoncurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Other assets</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Fair Value Measurement Inputs and Valuation Techniques [Table]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Fair Value Measurement Inputs and Valuation Techniques [Table]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_SecuredNotesCashPaymentsToNoteHolders_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Secured Notes, Cash Payments to Note Holders</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_SecuredNotesCashPaymentsToNoteHolders_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Secured Notes, Cash Payments to Note Holders</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_SecuredNotesCashPaymentsToNoteHolders_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Secured notes, cash payments to note holders</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Antidilutive Securities [Axis]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Antidilutive Securities [Axis]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OperatingLossCarryforwardsLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Operating Loss Carryforwards [Line Items]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_A2021StockOptionPlanMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">2021 Stock Option Plan</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_A2021StockOptionPlanMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">2021 Stock Option Plan [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_A2021StockOptionPlanMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">2021 Stock Option Plan</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_LiabilityOfWarrantsOnCommonStockCarriedAtFairValueTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Liability of Warrants on Common Stock Carried at Fair Value</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_LiabilityOfWarrantsOnCommonStockCarriedAtFairValueTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Liability of Warrants on Common Stock Carried at Fair Value [Text Block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_LiabilityOfWarrantsOnCommonStockCarriedAtFairValueTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Liability of Warrants on Common Stock Carried at Fair Value</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncomeTaxPaidForeignAfterRefundReceived_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Income Tax Paid, Foreign, after Refund Received</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncomeTaxPaidForeignAfterRefundReceived_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Income Tax Paid, Foreign, after Refund Received, Total</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncomeTaxPaidForeignAfterRefundReceived_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Cash income tax payments incurred</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncomeTaxPaidForeignAfterRefundReceived_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Cash paid for income taxes for foreign subsidiary</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_InterestExpenseDebt_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Interest Expense, Debt</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_InterestExpenseDebt_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Interest Expense, Debt, Total</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_InterestExpenseDebt_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Interest expense, debt</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_NonRule10B51ArrModifiedFlag_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Non Rule 10b5 1 Arr Modified [Flag]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_NonRule10B51ArrModifiedFlag_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Non Rule 10b5 1 arr modified.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_NonRule10B51ArrModifiedFlag_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Non Rule 10b5 1 Arr Modified</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DebtInstrumentUnamortizedDiscount_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Debt Instrument, Unamortized Discount</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DebtInstrumentUnamortizedDiscount_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Debt Instrument, Unamortized Discount, Total</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DebtInstrumentUnamortizedDiscount_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Debt instrument, unamortized discount</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DebtInstrumentUnamortizedDiscount_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Less: Amount of debt discount to be amortized subsequent to December 31, 2025</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DebtInstrumentUnamortizedDiscount_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Less: Amount of debt discount to be amortized subsequent to December 31, 2025</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StateAndLocalJurisdictionMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">State and Local Jurisdiction [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StateAndLocalJurisdictionMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">State</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AccumulatedOtherComprehensiveIncomeMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">AOCI Attributable to Parent [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AccumulatedOtherComprehensiveIncomeMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Accumulated Other Comprehensive (Loss) [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_NameOfMajorCustomerDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Customer [Domain]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_NameOfMajorCustomerDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Customer [Domain]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromCurrentPeriodTaxPositions_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Unrecognized Tax Benefits, Decrease Resulting from Current Period Tax Positions</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromCurrentPeriodTaxPositions_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Decrease in unrecognized tax benefits due to additional research and development credits</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromCurrentPeriodTaxPositions_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Decreases based on tax positions related to the current year</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_ProceedsFromIssuanceOfLongTermDebtExcludingConvertibleDebt_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Proceeds from issuance of long term debt excluding convertible debt.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_ProceedsFromIssuanceOfLongTermDebtExcludingConvertibleDebt_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Proceeds From Issuance Of Long Term Debt Excluding Convertible Debt</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_ProceedsFromIssuanceOfLongTermDebtExcludingConvertibleDebt_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Proceeds from equipment loan</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_LesseeLeaseLiabilityToBePaid_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Lessee, Lease, Liability, To Be Paid</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_LesseeLeaseLiabilityToBePaid_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Lessee, Lease, Liability, To Be Paid</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_LesseeLeaseLiabilityToBePaid_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Total operating lease payments</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_IssuanceOfCommonStockInConnectionWithWarrantCancellation_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Issuance of common stock in connection with warrant cancellation</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_IssuanceOfCommonStockInConnectionWithWarrantCancellation_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Issuance of Common Stock in Connection With Warrant Cancellation</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_IssuanceOfCommonStockInConnectionWithWarrantCancellation_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Issuance of common stock in connection with warrant cancellation.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Increase (Decrease) in Stockholders' Equity [Roll Forward]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Increase (Decrease) in Stockholders' Equity [Roll Forward]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_SecondSecuredNotesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Second Secured Notes</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_SecondSecuredNotesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Second Secured Notes [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_SecondSecuredNotesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Second Secured Notes</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_SalesWithVariableConsiderations_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Sales with Variable Considerations</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_SalesWithVariableConsiderations_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Sales with Variable Considerations</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_SalesWithVariableConsiderations_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Sales with Variable Considerations</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_SecuredNotesAccretingDiscountsAmortizedToInterestExpenses_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Secured notes, accreting discounts, amortized to interest expenses.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_SecuredNotesAccretingDiscountsAmortizedToInterestExpenses_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Secured Notes, Accreting Discounts, Amortized to Interest Expenses</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_SecuredNotesAccretingDiscountsAmortizedToInterestExpenses_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Secured notes, accreting discounts, amortized to interest expense</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_ThirdSecuredNotesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Third secured notes.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_ThirdSecuredNotesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Third Secured Notes [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_ThirdSecuredNotesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Third Secured Notes</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_BusinessAcquisitionEquityInterestIssuedOrIssuableValueAssigned_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Business Combination, Consideration Transferred, Equity Interest, Share Issued, Value</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_BusinessAcquisitionEquityInterestIssuedOrIssuableValueAssigned_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Fair value of total earnout shares</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DeferredIncomeTaxExpenseBenefitContinuingOperationsAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Deferred</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DeferredIncomeTaxExpenseBenefitContinuingOperationsAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Deferred Income Tax Expense (Benefit), Continuing Operations [Abstract]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DebtInstrumentMaturityDate_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Secured notes, maturity date</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DebtInstrumentMaturityDate_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Debt Instrument, Maturity Date</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DebtInstrumentMaturityDate_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Maturity date</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_MinimumMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Minimum [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_MinimumMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Minimum</link:label>
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          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Granted (in dollars per share)</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_ContingentConsiderationLiabilityEarnoutPeriodNumberOfTranches_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Contingent Consideration, Liability, Earnout Period, Number Of Tranches</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_ContingentConsiderationLiabilityEarnoutPeriodNumberOfTranches_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Contingent Consideration, Liability, Earnout Period, Number Of Tranches</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_ContingentConsiderationLiabilityEarnoutPeriodNumberOfTranches_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Number of tranches</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AssetsCurrentAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Assets, Current [Abstract]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AssetsCurrentAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Current assets:</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_WarrantToPurchaseCommonStockMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Warrant To Purchase Common Stock</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_WarrantToPurchaseCommonStockMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Warrant To Purchase Common Stock [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_WarrantToPurchaseCommonStockMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Common stock warrants</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_WarrantToPurchaseCommonStockMember_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Warrant to purchase common stock</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_ArrayedNotesAcquisitionCorpMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Arrayed Notes Acquisition Corp [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_ArrayedNotesAcquisitionCorpMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Arrayed Notes Acquisition Corp [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_ArrayedNotesAcquisitionCorpMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Arrayed Notes Acquisition Corp</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_PlacementAgencyAgreementSharesPurchaseNumberOfSharesOfCommonStockSoldInOffering_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Placement Agency Agreement, Shares, Purchase Number of Shares of Common Stock Sold in Offering</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_PlacementAgencyAgreementSharesPurchaseNumberOfSharesOfCommonStockSoldInOffering_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Placement Agency Agreement, Shares, Purchase Number of Shares of Common Stock Sold in Offering</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_PlacementAgencyAgreementSharesPurchaseNumberOfSharesOfCommonStockSoldInOffering_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Placement Agency Agreement, Shares, Purchase Number of Shares of Common Stock Sold in Offering</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FairValueInputsLevel3Member_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Fair Value, Inputs, Level 3 [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FairValueInputsLevel3Member_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Level 3</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LiabilitiesFairValueDisclosureAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Liabilities, Fair Value Disclosure [Abstract]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LiabilitiesFairValueDisclosureAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Liabilities</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_Customer1Member_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Customer 1 [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_Customer1Member_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Customer 1</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_Customer1Member_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Customer 1</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ProceedsFromLongTermLinesOfCredit_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Proceeds from Long-Term Lines of Credit</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ProceedsFromLongTermLinesOfCredit_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Gross proceeds from BEPO Offering</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfFairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfFairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_AverageMarketCapitalizationAmount_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Average market capitalization amount.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_AverageMarketCapitalizationAmount_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Average Market Capitalization Amount</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_AverageMarketCapitalizationAmount_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Average market capitalization</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LiabilitiesCurrentAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Liabilities, Current [Abstract]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LiabilitiesCurrentAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Current liabilities:</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ClassOfWarrantOrRightUnissued_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Class of Warrant or Right, Unissued</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ClassOfWarrantOrRightUnissued_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Class of Warrant or Right, Unissued</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ClassOfWarrantOrRightUnissued_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Class of warrant or right, unissued</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_A2021EmployeeStockPurchasePlanMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">2021 Employee Stock Purchase Plan</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_A2021EmployeeStockPurchasePlanMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">2021 Employee Stock Purchase Plan [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_A2021EmployeeStockPurchasePlanMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">2021 Employee Stock Purchase Plan</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_ScheduleOfContingentEarnoutLiabilitiesTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Schedule Of Contingent Earnout Liabilities</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_ScheduleOfContingentEarnoutLiabilitiesTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Schedule Of Contingent Earnout Liabilities [Table Text Block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_ScheduleOfContingentEarnoutLiabilitiesTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Schedule Of Contingent Earnout Liabilities</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ManagementAndServiceFeesIncentiveRate_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Service fees rate</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ManagementAndServiceFeesIncentiveRate_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Management and Service Fees, Incentive Rate</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SharesOutstanding_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Shares, Outstanding</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SharesOutstanding_lbl" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel">Balance as of end of period (in shares)</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SharesOutstanding_lbl" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel">Balance as of beginning of period (in shares)</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPositionFairValueTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Debt Securities, Available-for-Sale, Unrealized Loss Position, Fair Value [Table Text Block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPositionFairValueTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Breakdown of Available-for-sale, Unrealized Loss Position, Fair Value</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OperatingLossCarryforwards_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Operating Loss Carryforwards</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OperatingLossCarryforwards_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Net operating losses</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AccountsReceivableNetCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Total</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AccountsReceivableNetCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Accounts Receivable, after Allowance for Credit Loss, Current</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AccountsReceivableNetCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Accounts receivable, net</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Schedule of Accounts Receivable, Net</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommitmentsAndContingencies_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Commitments and Contingencies</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommitmentsAndContingencies_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Commitments and contingencies (Note 13)</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommitmentsAndContingencies_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Commitments and Contingencies, Total</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LesseeLeasesPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Assets Under Lease Agreements (as Lessee)</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LesseeLeasesPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Lessee, Leases [Policy Text Block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_lbl" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel">Balance as of end of period (in dollars per share)</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_lbl" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel">Balance as of beginning of period (in dollars per share)</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Balance as of beginning of period (in dollars per share)</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_OtherLocationsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Other Locations</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_OtherLocationsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Other Locations [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_OtherLocationsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Other</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Shares Issued, Shares, Share-Based Payment Arrangement, after Forfeiture</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Shares Issued, Shares, Share-Based Payment Arrangement, after Forfeiture, Total</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Stock-based compensation (in shares)</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ProvisionForDoubtfulAccounts_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Accounts Receivable, Credit Loss Expense (Reversal)</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ProvisionForDoubtfulAccounts_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Provision for credit losses</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ProvisionForDoubtfulAccounts_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Provision for credit loss related to trade accounts receivable</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_GeneralAndAdministrativeExpenseMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">General and Administrative Expense [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_GeneralAndAdministrativeExpenseMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">General and administrative</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityChangeDueToExchange_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Change Due to Exchange</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityChangeDueToExchange_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Fair value, measurement with unobservable inputs reconciliation, recurring basis, liability, change due to exchange.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityChangeDueToExchange_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Change due to exchange</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OperatingLeaseLiability_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Operating Lease, Liability</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OperatingLeaseLiability_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Total operating lease liabilities</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_InventoryWorkInProcessNetOfReserves_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Work-in-progress</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_InventoryWorkInProcessNetOfReserves_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Inventory, Work in Process, Net of Reserves</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ErrorCorrectionsAndPriorPeriodAdjustmentsRestatementLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Error Corrections and Prior Period Adjustments Restatement [Line Items]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_AuditorFirmId_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Auditor Firm ID</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_AuditorFirmId_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Auditor Firm ID</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_A2024PrivateWarrantBMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">A 2024 Private Warrant B.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_A2024PrivateWarrantBMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">A 2024 Private Warrant B [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_A2024PrivateWarrantBMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">2024 Private Warrant B [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_A2024PrivateWarrantBMember_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">BEPO Agent Warrants [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SaleOfStockPercentageOfOwnershipAfterTransaction_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Sale of Stock, Percentage of Ownership after Transaction</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SaleOfStockPercentageOfOwnershipAfterTransaction_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Percentage of issued and outstanding common stock</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_SecuritiesPurchaseAgreementPartialRedemptionPayment_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Securities purchase agreement , partial redemption payment.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_SecuritiesPurchaseAgreementPartialRedemptionPayment_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Securities Purchase Agreement , Partial Redemption Payment</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_SecuritiesPurchaseAgreementPartialRedemptionPayment_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Securities purchase agreement, partial redemption payment</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StockholdersEquityReverseStockSplit_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Stockholders' Equity, Reverse Stock Split</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StockholdersEquityReverseStockSplit_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Reverse Stock Split</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AccountsReceivableGrossCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Accounts Receivable, before Allowance for Credit Loss, Current</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AccountsReceivableGrossCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Trade receivables</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value [Abstract]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Aggregate Intrinsic Value</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_PropertyAndEquipmentNetAndEquipmentSubjectToOperatingLeaseNetPolicyPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Property and Equipment Net and Equipment Subject to Operating Lease Net Policy [Policy Text Block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_PropertyAndEquipmentNetAndEquipmentSubjectToOperatingLeaseNetPolicyPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Property and Equipment, Net and Equipment Subject to Operating Lease, Net, Policy.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_PropertyAndEquipmentNetAndEquipmentSubjectToOperatingLeaseNetPolicyPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Property and Equipment, Net and Equipment Subject to Operating Lease, Net</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_CommonStockConvertibleConversionPrice_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Common stock conversion per share</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_CommonStockConvertibleConversionPrice_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Common Stock Convertible Conversion Price</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_CommonStockConvertibleConversionPrice_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Common stock convertible conversion price.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_CostOf3DPrinterAndPartsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Cost Of 3D Printer And Parts [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_CostOf3DPrinterAndPartsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Cost of 3D printer and parts.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_A2024PrivatePlacementWarrantsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">2024 private placement warrants.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_A2024PrivatePlacementWarrantsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">A 2024 Private Placement Warrants [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_A2024PrivatePlacementWarrantsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">2024 Private Warrants [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_A2024PrivatePlacementWarrantsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">2024 Private Warrants [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ConcentrationRiskByBenchmarkAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Concentration Risk Benchmark [Axis]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ConcentrationRiskByBenchmarkAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Concentration Risk Benchmark [Axis]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Long-Term Debt, Maturity, Year Two</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">2027</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ProceedsFromOtherEquity_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Proceeds from Other Equity</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ProceedsFromOtherEquity_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Gross proceeds</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFour_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Thereafter</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFour_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Lessee Operating Lease Liability Payments Due After Year Four</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFour_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Lessee operating lease liability payments due after year four.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FinanceLeaseLiabilityCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Finance Lease, Liability, Current</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FinanceLeaseLiabilityCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Current (Accrued expense and other current liabilities)</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FinanceLeaseLiabilityCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Less current portion</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OperatingExpenseMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Stock-based compensation recorded in operating expense</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OperatingExpenseMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Operating Expense [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LesseeLeaseDescriptionTable_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Lessee, Lease, Description [Table]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FinanceLeaseWeightedAverageDiscountRatePercent_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Weighted - average discount rate - financing lease</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FinanceLeaseWeightedAverageDiscountRatePercent_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Finance Lease, Weighted Average Discount Rate, Percent</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_PaymentsForIssuanceCostRelatedToAugustTwoThousandTwentyFiveOffering_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Payments for Issuance Cost Related to August Two Thousand Twenty Five Offering</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_PaymentsForIssuanceCostRelatedToAugustTwoThousandTwentyFiveOffering_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Payments for issuance cost related to august two thousand twenty five offering.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_PaymentsForIssuanceCostRelatedToAugustTwoThousandTwentyFiveOffering_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Payment for issuance cost related to August 2025 Offering</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_MeasurementInputExpectedVolatilityMember_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Expected volatility</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_MeasurementInputExpectedVolatilityMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Measurement Input, Expected Volatility</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_MeasurementInputExpectedVolatilityMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Measurement Input, Expected Volatility [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_MeasurementInputExpectedVolatilityMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Expected volatility</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Percent</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Change in valuation allowance</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Change in valuation allowance</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Change in valuation allowance, Percentage</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel">Change in valuation allowance, Percentage</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_LongTermDebtCurrentMaturities_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Long-Term Debt, Current Maturities</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_LongTermDebtCurrentMaturities_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Long-Term Debt, Current Maturities</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_LongTermDebtCurrentMaturities_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Debt&#8201;&#8211;&#8201;current portion</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_LongTermDebtCurrentMaturities_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Carrying value of debt</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FinanceLeaseRightOfUseAssetAccumulatedAmortization_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Finance Lease, Right-of-Use Asset, Accumulated Amortization</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FinanceLeaseRightOfUseAssetAccumulatedAmortization_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Equipment leased to customers, accumulated depreciation</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_StockIssuedDuringPeriodSharesIssuanceOfCommonStockInConnectionWithWarrantCancellation_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Stock Issued During Period Shares Issuance Of Common Stock In Connection With Warrant Cancellation</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_StockIssuedDuringPeriodSharesIssuanceOfCommonStockInConnectionWithWarrantCancellation_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Stock issued during period, shares, issuance of common stock in connection with warrant cancellation.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_StockIssuedDuringPeriodSharesIssuanceOfCommonStockInConnectionWithWarrantCancellation_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Issuance of common stock in connection with warrant cancellation (in shares)</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_EquipmentAvailableForLeaseMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Equipment Available For Lease [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_EquipmentAvailableForLeaseMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Equipment available for lease.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_EquipmentAvailableForLeaseMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Equipment available for lease</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_A2024PrivateWarrantsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">A 2024 Private Warrants [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_A2024PrivateWarrantsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">A 2024 Private Warrants [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_A2024PrivateWarrantsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">2024 Private Warrants</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_FairValueOfCustomerLiabilityMeasurementInput_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Fair Value of Customer Liability Measurement Input</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_FairValueOfCustomerLiabilityMeasurementInput_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">fair value of customer liability measurement input.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_FairValueOfCustomerLiabilityMeasurementInput_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Customer liability measurement input</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LongtermDebtTypeDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Long-Term Debt, Type [Domain]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LongtermDebtTypeDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Long-term Debt, Type [Domain]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="cyd_CybersecurityRiskManagementPositionsOrCommitteesResponsibleTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Cybersecurity Risk Management Positions or Committees Responsible [Text Block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Weighted Average Number of Shares Outstanding, Basic, Total</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Basic weighted average shares outstanding</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Shares used in computing net income (loss) per share Basic</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Shares used in computing net loss per share basic</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_EarnoutShareUnitsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Earnout Share Units</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_EarnoutShareUnitsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Earnout Share Units [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_EarnoutShareUnitsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Earnout shares&#8211;employees</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RevenueFromExternalCustomersByGeographicAreasTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Revenue from External Customers by Geographic Areas [Table Text Block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RevenueFromExternalCustomersByGeographicAreasTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Revenue by Geographic Area</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_UnderwritingDiscountsAndCommissionsAndOtherEstimatedOfferingExpensesPayable_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Underwriting Discounts and Commissions, and Other Estimated Offering Expenses Payable</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_UnderwritingDiscountsAndCommissionsAndOtherEstimatedOfferingExpensesPayable_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Underwriting discounts and commissions, and other estimated offering expenses payable.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_UnderwritingDiscountsAndCommissionsAndOtherEstimatedOfferingExpensesPayable_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Underwriting discounts and commissions, and other estimated offering expenses payable</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_DocumentInformationLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Document Information [Line Items]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_DocumentInformationLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Document Information [Line Items]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfEffectiveIncomeTaxRateReconciliationTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfEffectiveIncomeTaxRateReconciliationTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Schedule of Effective Income Tax Rate Reconciliation</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DeferredTaxLiabilitiesLeasingArrangements_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Right of use assets</link:label>
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          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Schedule of Share-Based Compensation Arrangements by Share-Based Payment Award [Table]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PropertyPlantAndEquipmentTypeDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Long-Lived Tangible Asset [Domain]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PropertyPlantAndEquipmentTypeDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Long-Lived Tangible Asset [Domain]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StockIssuedDuringPeriodSharesReverseStockSplits_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Stock Issued During Period, Shares, Reverse Stock Splits</link:label>
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          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ProceedsFromIssuanceOfPrivatePlacement_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Fair value of private placement</link:label>
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          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SubsequentEventsTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Subsequent Events</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_InventoryRawMaterialsNetOfReserves_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Inventory, Raw Materials, Net of Reserves</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_InventoryRawMaterialsNetOfReserves_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Raw materials</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_RDOWarrantsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">RDO Warrants [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_RDOWarrantsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">RDO warrants.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LongTermDebt_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Long-Term Debt</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LongTermDebt_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Long-Term Debt</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LongTermDebt_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Debt as of December 31, 2025</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DeferredTaxAssetInterestCarryforward_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Deferred Tax Asset, Interest Carryforward</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DeferredTaxAssetInterestCarryforward_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Interest expense</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_lbl" xlink:role="http://www.xbrl.org/2003/role/label">APIC, Share-Based Payment Arrangement, Increase for Cost Recognition</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Stock-based compensation</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">APIC, Share-Based Payment Arrangement, Increase for Cost Recognition, Total</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_HighbridgeHoldersAndAnsonHoldersMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Highbridge Holders and Anson Holders</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_HighbridgeHoldersAndAnsonHoldersMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Highbridge Holders and Anson Holders [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_HighbridgeHoldersAndAnsonHoldersMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Highbridge Holders and Anson Holders</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DeferredTaxAssetsInProcessResearchAndDevelopment_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Deferred Tax Asset, In-Process Research and Development</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DeferredTaxAssetsInProcessResearchAndDevelopment_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Section 174 research and development capitalization</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Change in valuation allowance</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StockholdersEquity_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Equity, Attributable to Parent</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StockholdersEquity_lbl" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel">Balance as of end of period</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StockholdersEquity_lbl" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel">Balance as of beginning of period</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StockholdersEquity_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Stockholders' equity</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StockholdersEquity_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Total stockholders&#8217; equity</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StockholdersEquity_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Stockholders' deficit</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StockholdersEquity_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Total stockholders' equity</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PreferredStockParOrStatedValuePerShare_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Preferred Stock, Par or Stated Value Per Share</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PreferredStockParOrStatedValuePerShare_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Preferred stock, par value</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_BasisOfAccountingPolicyPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Basis of Accounting, Policy [Policy Text Block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_BasisOfAccountingPolicyPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Basis of Presentation</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StatementOfStockholdersEquityAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Statement of Stockholders' Equity [Abstract]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationAwardTrancheTwoMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Tranche Two</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationAwardTrancheTwoMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Share-Based Payment Arrangement, Tranche Two [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CostOfSalesPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Cost of Revenue</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CostOfSalesPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Cost of Goods and Service [Policy Text Block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_DecemberTwoThousandTwentyThreeRegisteredWarrantsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">December Two Thousand Twenty Three Registered Warrants [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_DecemberTwoThousandTwentyThreeRegisteredWarrantsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">December two thousand twenty three registered warrants.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_DecemberTwoThousandTwentyThreeRegisteredWarrantsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">December 2023 Registered Warrants</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_UseOfEstimates_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Use of Estimates, Policy [Policy Text Block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_UseOfEstimates_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Use of Estimates</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfEquityMethodInvestmentsTable_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Equity Method Investment [Table]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_CostOf3DPrinterMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Cost of 3D Printer</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_CostOf3DPrinterMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Cost of 3D Printer [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_CostOf3DPrinterMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Cost of 3D Printer</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_ResearchAndDevelopmentLaboratoryEquipmentMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Research And Development Laboratory Equipment</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_ResearchAndDevelopmentLaboratoryEquipmentMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Research And Development Laboratory Equipment [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_ResearchAndDevelopmentLaboratoryEquipmentMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Lab equipment and other equipment</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FinanceLeaseImpairmentLoss_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Finance Lease, Impairment Loss</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FinanceLeaseImpairmentLoss_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Impairment charge</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LeaseholdImprovementsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Leasehold Improvements [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LeaseholdImprovementsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Leasehold improvements</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SellingAndMarketingExpenseMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Selling and Marketing Expense [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SellingAndMarketingExpenseMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Selling and marketing</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FairValueDisclosuresTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Fair Value Disclosures [Text Block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FairValueDisclosuresTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Fair Value Measurements</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="country_NL_lbl" xlink:role="http://www.xbrl.org/2003/role/label">NETHERLANDS</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="country_NL_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Netherlands</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding [Roll Forward]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Options</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_OtherMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Other</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_OtherMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Other [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_OtherMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Other.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DebtInstrumentNameDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Debt Instrument, Name [Domain]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DebtInstrumentNameDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Debt Instrument, Name [Domain]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_SeniorSecuredConvertiblePromissoryNoteMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Senior secured convertible promissory note [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_SeniorSecuredConvertiblePromissoryNoteMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Senior Secured Convertible Promissory Note [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_SeniorSecuredConvertiblePromissoryNoteMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Senior Secured Convertible Promissory Note</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfUnrecognizedTaxBenefitsRollForwardTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Schedule of Unrecognized Tax Benefits Roll Forward [Table Text Block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfUnrecognizedTaxBenefitsRollForwardTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Schedule of Unrecognized Tax Benefits Roll Forward</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_MasterServiceAgreementMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Master Service Agreement [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_MasterServiceAgreementMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Master service agreement.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SegmentReportingCodmIndividualTitleAndPositionOrGroupOrCommitteeNameExtensibleEnumeration_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Segment Reporting, CODM, Individual Title and Position or Group Name [Extensible Enumeration]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_GainLossOnFairValueOfContingentEarnoutLiability_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Gain (Loss) On Fair Value Of Contingent Earnout Liability</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_GainLossOnFairValueOfContingentEarnoutLiability_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Gain (Loss) On Fair Value Of Contingent Earnout Liability</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_GainLossOnFairValueOfContingentEarnoutLiability_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Gain (loss) on fair value of contingent earnout liabilities</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_GainLossOnFairValueOfContingentEarnoutLiability_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Gain on fair value of contingent earnout liabilities</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PlanNameDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Plan Name [Domain]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PlanNameDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Plan Name [Domain]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_GoingConcernPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Going Concern</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_GoingConcernPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Going Concern [Policy Text Block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_GoingConcernPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Going Concern</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_InterestExpense_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Interest Expense</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_InterestExpense_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Interest Expense, Operating and Nonoperating, Total</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_InterestExpense_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel">Interest expense</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_InterestExpense_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Interest expense</link:label>
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          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExpectedToVestWeightedAverageGrantDateFairValue_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Share-Based Compensation Arrangement By Share-Based Payment Award, Equity Instruments Other Than Options, Expected To Vest, Weighted Average Grant Date Fair Value</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExpectedToVestWeightedAverageGrantDateFairValue_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Expected to vest (in dollars per share)</link:label>
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          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Entity [Domain]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_BuildingMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Building [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_BuildingMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Building</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CreditFacilityAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Credit Facility [Axis]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="cyd_CybersecurityRiskMateriallyAffectedOrReasonablyLikelyToMateriallyAffectRegistrantTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Cybersecurity Risk Materially Affected or Reasonably Likely to Materially Affect Registrant [Text Block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_A3DPrinterAndPartsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">3D Printer and parts</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_A3DPrinterAndPartsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">A 3D Printer And Parts [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_A3DPrinterAndPartsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">A 3D printer and parts.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ImpairmentOfLongLivedAssetsHeldForUse_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Impairment expense</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ImpairmentOfLongLivedAssetsHeldForUse_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Impairment, Long-Lived Asset, Held-for-Use</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ImpairmentOfLongLivedAssetsHeldForUse_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Impairment, Long-Lived Asset, Held-for-Use, Total</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableWeightedAverageExercisePrice_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested and Expected to Vest, Exercisable, Weighted Average Exercise Price</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableWeightedAverageExercisePrice_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Vested and exercisable as of end of period (in dollars per share)</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CurrentStateAndLocalTaxExpenseBenefit_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Current State and Local Tax Expense (Benefit)</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CurrentStateAndLocalTaxExpenseBenefit_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">State</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_RevenueTimeAcceptanceTestPeriod_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Revenue, Time Acceptance Test, Period</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_RevenueTimeAcceptanceTestPeriod_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Revenue, Time Acceptance Test, Period</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_RevenueTimeAcceptanceTestPeriod_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Time acceptance test, period</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DebtInstrumentRepaidPrincipal_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Debt Instrument, Repaid, Principal</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DebtInstrumentRepaidPrincipal_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Repaid of principal and accrued interest</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_BusinessDescriptionAndBasisOfPresentationTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Business Description and Basis of Presentation [Text Block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_BusinessDescriptionAndBasisOfPresentationTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Description of Business and Basis of Presentation</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="cyd_CybersecurityRiskManagementExpertiseOfManagementResponsibleTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Cybersecurity Risk Management Expertise of Management Responsible [Text Block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FinanceLeaseLiabilityPaymentsDueNextTwelveMonths_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Finance Lease, Liability, to be Paid, Year One</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FinanceLeaseLiabilityPaymentsDueNextTwelveMonths_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">2026</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_Customer10Member_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Customer 10.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_Customer10Member_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Customer 10 [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_Customer10Member_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Customer 10</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ClassOfWarrantOrRightOutstanding_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Class of Warrant or Right, Outstanding</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ClassOfWarrantOrRightOutstanding_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Number of Warrants (in shares)</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ClassOfWarrantOrRightOutstanding_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Number of warrants to purchase shares</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DeferredChargesPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Deferred Charges, Policy [Policy Text Block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DeferredChargesPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Deferred Transaction Costs</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_LeaseLiabilityCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Lease, Liability, Current</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_LeaseLiabilityCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Lease, Liability, Current</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_LeaseLiabilityCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Lease liability&#8201;&#8211;&#8201;current portion</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_Customer2Member_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Customer 2</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_Customer2Member_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Customer 2 [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_Customer2Member_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Customer 2</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncomeTaxReconciliationOtherAdjustments_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Other</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncomeTaxReconciliationOtherAdjustments_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Effective Income Tax Rate Reconciliation, Other Adjustments, Amount</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ClassOfWarrantOrRightTable_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Class of Warrant or Right [Table]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ClassOfWarrantOrRightTable_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Class of Warrant or Right [Table]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ForeignCountryMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Foreign Tax Jurisdiction [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearThree_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Long Term Debt Maturities Repayments Of Principal After Year Three</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearThree_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Long term debt maturities repayments of principal after year three</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearThree_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Thereafter</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AccountingStandardsUpdateExtensibleList_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Accounting Standards Update [Extensible Enumeration]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityAddressCityOrTown_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Entity Address, City or Town</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityAddressCityOrTown_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Entity Address, City or Town</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_AugustTwoThousandTwentyFourRegisteredWarrantsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">August Two Thousand Twenty Four Registered Warrants [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_AugustTwoThousandTwentyFourRegisteredWarrantsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">August two thousand twenty four registered warrants.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_AugustTwoThousandTwentyFourRegisteredWarrantsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">August 2024 Registered Warrants</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_BusinessCombinationContingentConsiderationLiability_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Business Combination, Contingent Consideration, Liability</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_BusinessCombinationContingentConsiderationLiability_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Contingent earnout liabilities</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_BusinessCombinationContingentConsiderationLiability_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Business Combination, Contingent Consideration, Liability, Total</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_BusinessCombinationContingentConsiderationLiability_lbl" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel">Beginning Balance</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_BusinessCombinationContingentConsiderationLiability_lbl" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel">Ending Balance</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_AprilTwoThousandTwentyFourRegisteredWarrantsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">April Two Thousand Twenty Four Registered Warrants [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_AprilTwoThousandTwentyFourRegisteredWarrantsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">April two thousand twenty four registered warrants.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_AprilTwoThousandTwentyFourRegisteredWarrantsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">April 2024 Registered Warrants</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NumberOfReportableSegments_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Number of Reportable Segments</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NumberOfReportableSegments_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Number of reportable segment</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_SecurityExchangeName_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Security Exchange Name</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_SecurityExchangeName_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Security Exchange Name</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CreditFacilityDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Credit Facility [Domain]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_EuropeMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Europe [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_EuropeMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Europe</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_ComputersAndSoftwareMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Computers And Software</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_ComputersAndSoftwareMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Computers And Software [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_ComputersAndSoftwareMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Computers and software</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DebtInstrumentCarryingAmount_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Outstanding debt</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DebtInstrumentCarryingAmount_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Debt</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DebtInstrumentCarryingAmount_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Outstanding balance</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DebtInstrumentCarryingAmount_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Total</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_ContingentConsiderationLiabilityEarnoutPeriod_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Contingent Consideration, Liability, Earnout Period</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_ContingentConsiderationLiabilityEarnoutPeriod_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Contingent Consideration, Liability, Earnout Period</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_ContingentConsiderationLiabilityEarnoutPeriod_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Earnout period</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Other</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Effective Income Tax Rate Reconciliation, Other Adjustments, Percent</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Other</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PropertyPlantAndEquipmentGross_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Property, Plant and Equipment, Gross</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PropertyPlantAndEquipmentGross_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Total property, plant and equipment</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_EquipmentOnLeaseMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Equipment On Lease</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_EquipmentOnLeaseMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Equipment On Lease [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_EquipmentOnLeaseMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Equipment on lease</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_EquipmentOnLeaseMember_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Equipment available on lease</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Loss before provision for income taxes</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Loss before income taxes</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Income (loss) before provision for income taxes</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingNumber_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingNumber_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Options vested and expected to vest as of end of period (in shares)</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_InterestExpenseBorrowings_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Interest Expense, Borrowings</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_InterestExpenseBorrowings_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Interest expense, borrowings</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_InterestExpenseBorrowings_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Interest Expense, Borrowings, Total</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ConcentrationRiskTypeDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Concentration Risk Type [Domain]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ConcentrationRiskTypeDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Concentration Risk Type [Domain]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_GainLossOnWarrantCancellation_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Loss on warrant cancellation</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_GainLossOnWarrantCancellation_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Gain (loss) on warrant cancellation</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_GainLossOnWarrantCancellation_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Gain (loss) on warrant cancellation.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_GainLossOnWarrantCancellation_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Loss on warrant cancellation</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_DeferredTaxLiabilitiesFixedAssetsAndIntangibles_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Deferred Tax Liabilities, Fixed Assets and Intangibles</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_DeferredTaxLiabilitiesFixedAssetsAndIntangibles_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Deferred tax liabilities, fixed assets and intangibles.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_DeferredTaxLiabilitiesFixedAssetsAndIntangibles_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Fixed assets and intangibles</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_MeasurementInputTypeDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Measurement Input Type [Domain]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_MeasurementInputTypeDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Measurement Input Type [Domain]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AntidilutiveSecuritiesNameDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Antidilutive Securities, Name [Domain]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AntidilutiveSecuritiesNameDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Antidilutive Securities, Name [Domain]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Percent</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Foreign tax effects</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DebtInstrumentIncreaseAccruedInterest_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Debt Instrument, Increase, Accrued Interest</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DebtInstrumentIncreaseAccruedInterest_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Debt instrument, accrued interest</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_InventoryNet_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Inventory, Net</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_InventoryNet_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Inventories, net</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_InventoryNet_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Total</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_InventoryNet_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Inventories</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_SecuredNotesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Secured Notes</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_SecuredNotesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Secured Notes [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_SecuredNotesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Secured Notes</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_PlacementAgencyAgreementPercentPurchaseNumberOfSharesOfCommonStockSoldInOffering_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Placement Agency Agreement, Percent, Purchase Number of Shares of Common Stock Sold in Offering</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_PlacementAgencyAgreementPercentPurchaseNumberOfSharesOfCommonStockSoldInOffering_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Placement Agency Agreement, Percent, Purchase Number of Shares of Common Stock Sold in Offering</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_PlacementAgencyAgreementPercentPurchaseNumberOfSharesOfCommonStockSoldInOffering_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Placement Agency Agreement, Percent, Purchase Number of Shares of Common Stock Sold in Offering</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_lbl" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel">Cash and cash equivalents and restricted cash at end of period</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_lbl" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel">Cash and cash equivalents and restricted cash at beginning of period</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Total cash and cash equivalents, and restricted cash</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_InterestPaidNet_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Interest Paid, Excluding Capitalized Interest, Operating Activity</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_InterestPaidNet_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Cash paid for interest</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTable_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTable_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Share-based Payment Arrangement, Expensed and Capitalized, Amount [Table]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_RangeMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Statistical Measurement [Domain]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_RangeMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Statistical Measurement [Domain]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Class of Warrant or Right, Exercise Price of Warrants or Rights</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Exercise Price per Warrant (in dollars per share)</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Exercise price per warrant (in dollars per share)</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AssetsCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Assets, Current</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AssetsCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Total current assets</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AllocatedShareBasedCompensationExpense_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Share-Based Payment Arrangement, Expense</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AllocatedShareBasedCompensationExpense_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Stock-based compensation expense</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_DocumentPeriodEndDate_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Document Period End Date</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_DocumentPeriodEndDate_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Document Period End Date</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_PrivateWarrantsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Private Warrants</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_PrivateWarrantsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Private Warrants [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_PrivateWarrantsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Private Warrants [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EquityMethodInvestmentsAndJointVenturesAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Equity Method Investments and Joint Ventures [Abstract]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ManagementAndServiceFeesBaseRate_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Service fees rate</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ManagementAndServiceFeesBaseRate_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Management and Service Fees, Base Rate</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_TitleOfIndividualAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Title and Position [Axis]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FairValueMeasurementsFairValueHierarchyDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Fair Value Hierarchy and NAV [Domain]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FairValueMeasurementsFairValueHierarchyDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Fair Value Hierarchy and NAV [Domain]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DefinedContributionPlanCostRecognized_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Defined Contribution Plan, Cost</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DefinedContributionPlanCostRecognized_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Contributions</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_IcfrAuditorAttestationFlag_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">ICFR Auditor Attestation Flag</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_IcfrAuditorAttestationFlag_lbl" xlink:role="http://www.xbrl.org/2003/role/label">ICFR Auditor Attestation Flag</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_GainLossOnSaleOfPropertyPlantEquipment_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Loss on sale/disposal of fixed assets</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_GainLossOnSaleOfPropertyPlantEquipment_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Gain (Loss) on Disposition of Property Plant Equipment</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_GainLossOnSaleOfPropertyPlantEquipment_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Gain (Loss) on Disposition of Property Plant Equipment, Total</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_GainLossOnSaleOfPropertyPlantEquipment_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Loss on sale/disposal of fixed assets</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FinanceLeaseLiabilityNoncurrentStatementOfFinancialPositionExtensibleList_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FinanceLeaseLiabilityNoncurrentStatementOfFinancialPositionExtensibleList_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OperatingLeaseLiabilityCurrentStatementOfFinancialPositionExtensibleList_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OperatingLeaseLiabilityCurrentStatementOfFinancialPositionExtensibleList_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DefinedContributionPlanEmployersMatchingContributionAnnualVestingPercentage_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Defined Contribution Plan, Employers Matching Contribution, Annual Vesting Percentage</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DefinedContributionPlanEmployersMatchingContributionAnnualVestingPercentage_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Percentage of contributions that fully vest</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StatementOfFinancialPositionAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Statement of Financial Position [Abstract]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RestrictedStockUnitsRSUMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Restricted Stock Units (RSUs) [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RestrictedStockUnitsRSUMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Restricted stock units</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RestrictedStockUnitsRSUMember_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Restricted stock units</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_MomentusMasterServiceAgreementDisclosureTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Momentus Master Service Agreement Disclosure [Text Block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_MomentusMasterServiceAgreementDisclosureTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Momentus master service agreement disclosure.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_MomentusMasterServiceAgreementDisclosureTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Momentus Master Service Agreement</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_EffectiveIncomeTaxRateReconciliationResearchAndDevelopmentAmount_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Effective Income Tax Rate Reconciliation, Research and Development, Amount</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_EffectiveIncomeTaxRateReconciliationResearchAndDevelopmentAmount_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Effective Income Tax Rate Reconciliation, Research and Development, Amount</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_EffectiveIncomeTaxRateReconciliationResearchAndDevelopmentAmount_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Research and Development Credits</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RevenueRecognitionPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Revenue [Policy Text Block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RevenueRecognitionPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Revenue Recognition</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_AtTheMarketOfferingAggregateMarketValueOfVotingAndNonVotingCommonEquity_lbl" xlink:role="http://www.xbrl.org/2003/role/label">At The Market Offering , Aggregate Market Value of Voting and Non Voting Common Equity</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_AtTheMarketOfferingAggregateMarketValueOfVotingAndNonVotingCommonEquity_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">At The Market Offering , the aggregate market value of its voting and non-voting common equity held by non-affiliates.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_AtTheMarketOfferingAggregateMarketValueOfVotingAndNonVotingCommonEquity_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">At-the-Market Offering , Aggregate market value of voting and non-voting common equity held by non-affiliates</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_SecuredNotesPrincipalAmountRepaidPercentage_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Secured Notes, Principal Amount Repaid Percentage</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_SecuredNotesPrincipalAmountRepaidPercentage_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Secured Notes, Principal Amount Repaid Percentage.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_SecuredNotesPrincipalAmountRepaidPercentage_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Secured Notes at repayment price, percentage</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_VestingAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Vesting [Axis]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation [Abstract]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Cash and Cash Equivalents and Restricted Cash</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StatementClassOfStockAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Class of Stock [Axis]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StatementClassOfStockAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Class of Stock [Axis]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_EquipmentOnLeaseTotalPaymentsTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Equipment on Lease, Total Payments</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_EquipmentOnLeaseTotalPaymentsTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Equipment on Lease, Total Payments [Table Text Block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_EquipmentOnLeaseTotalPaymentsTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Equipment on Lease, Total Payments</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CurrentIncomeTaxExpenseBenefit_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Current Income Tax Expense (Benefit)</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CurrentIncomeTaxExpenseBenefit_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Current income tax expense (benefit)</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_ProductWarrantiesPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Product Warranties [Policy Text Block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_ProductWarrantiesPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Product warranties.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_ProductWarrantiesPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Product Warranties</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DebtSecuritiesAvailableForSaleRealizedGainLoss_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Debt Securities, Available-for-Sale, Realized Gain (Loss)</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DebtSecuritiesAvailableForSaleRealizedGainLoss_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Debt securities, available-for-sale, realized gain (loss)</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="cyd_CybersecurityRiskManagementStrategyAndGovernanceLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Cybersecurity Risk Management, Strategy, and Governance [Line Items]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_WarrantsAndRightsOutstandingMaturityDate_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Warrants and Rights Outstanding, Maturity Date</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_WarrantsAndRightsOutstandingMaturityDate_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Expiration Date</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_StockBasedCompensationExpenseIncludedInCostOfRevenue_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Stock- based compensation expense, included in cost of revenue</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_StockBasedCompensationExpenseIncludedInCostOfRevenue_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Stock- based compensation expense, included in cost of revenue</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_StockBasedCompensationExpenseIncludedInCostOfRevenue_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Share- based compensation expense, included in cost of revenue</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_Liabilities_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Liabilities</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_Liabilities_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Total liabilities</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_Liabilities_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Total liabilities</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_DebtInstrumentNumberOfAdvancesExecuted_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Debt Instrument, Number Of Advances Executed</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_DebtInstrumentNumberOfAdvancesExecuted_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Debt Instrument, Number Of Advances Executed</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_DebtInstrumentNumberOfAdvancesExecuted_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Number of advances</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Amount</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Foreign tax effects</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_July2020PublicCommonStockWarrantsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">July 2020 Public Common Stock Warrants</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_July2020PublicCommonStockWarrantsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">July 2020 Public Common Stock Warrants [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_July2020PublicCommonStockWarrantsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">July 2020 Public Common Stock Warrants</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Lessee, Operating Lease, Liability, to be Paid, Year Two</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">2027</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RestrictedCash_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Restricted Cash</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RestrictedCash_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Restricted cash (Other assets)</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RestrictedCash_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Restricted Cash, Total</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AdvertisingExpense_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Advertising Expense</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AdvertisingExpense_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Advertising Expense</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FinanceLeaseRightOfUseAssetAmortization_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Finance Lease, Right-of-Use Asset, Amortization</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FinanceLeaseRightOfUseAssetAmortization_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Deprecation expense</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Weighted Average Number of Shares Outstanding, Diluted, Total</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Diluted weighted average shares outstanding</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Shares used in computing net income (loss) per share Diluted</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Shares used in computing net loss per share diluted</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_Customer4Member_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Customer 4</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_Customer4Member_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Customer 4 [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_Customer4Member_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Customer 4</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_WarrantsPolicyPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Common Stock Warrants</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_WarrantsPolicyPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Warrants, Policy</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_WarrantsPolicyPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Warrants, Policy [Policy Text Block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_WarrantsPolicyPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Warrants for Redeemable Convertible Preferred Stock and Common Stock Warrants</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityFileNumber_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Entity File Number</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityFileNumber_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Entity File Number</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_ProceedsFromCapitalRaiseFromAugustWarrantInducement_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Proceeds from Capital Raise from August Warrant Inducement</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_ProceedsFromCapitalRaiseFromAugustWarrantInducement_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Proceeds from capital raise from august warrant inducement.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_ProceedsFromCapitalRaiseFromAugustWarrantInducement_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Proceeds from capital raise - August Warrant Inducement</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_BusinessCombinationContingentConsiderationLiabilityMeasurementInputTerm_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Business Combination, Contingent Consideration, Liability, Measurement Input, Term</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_BusinessCombinationContingentConsiderationLiabilityMeasurementInputTerm_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Business Combination, Contingent Consideration, Liability, Measurement Input, Term</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_BusinessCombinationContingentConsiderationLiabilityMeasurementInputTerm_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Expected Term (years)</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_AdvancesOnPurchases_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Advances On Purchases</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_AdvancesOnPurchases_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Advances On Purchases</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_AdvancesOnPurchases_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Vendor prepayments</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_FairValueAssumptionUsedInValuationTechniquesOfLiabilityTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Fair Value Assumption Used in Valuation Techniques of Liability [Table Text Block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_FairValueAssumptionUsedInValuationTechniquesOfLiabilityTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Fair value assumption used in valuation techniques of liability.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_FairValueAssumptionUsedInValuationTechniquesOfLiabilityTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Schedule of Fair Value Assumptions Used For Valuation Liablity</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_CoverAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Cover [Abstract]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_EligibleVelo3DEquityholdersMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Eligible Velo3D Equityholders</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_EligibleVelo3DEquityholdersMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Eligible Velo3D Equityholders [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_EligibleVelo3DEquityholdersMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Eligible Velo3D Equityholders</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_MeasurementInputTypeAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Measurement Input Type [Axis]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_MeasurementInputTypeAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Measurement Input Type [Axis]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_TwoThousandTwentyTwoPrivateWarrantRDOWarrantsPlacementAgentWarrantsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Two Thousand Twenty Two Private Warrant, RDO Warrants, Placement Agent Warrants [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_TwoThousandTwentyTwoPrivateWarrantRDOWarrantsPlacementAgentWarrantsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Two thousand twenty two private warrant, rdo warrants, placement agent warrants.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_TwoThousandTwentyTwoPrivateWarrantRDOWarrantsPlacementAgentWarrantsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">2022 Private Warrant, RDO Warrants, Placement Agent Warrants [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_PlacementAgencyAgreementCashFeeOfAggregatePurchasePrice_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Placement Agency Agreement, Cash Fee of Aggregate Purchase Price</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_PlacementAgencyAgreementCashFeeOfAggregatePurchasePrice_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Placement Agency Agreement, Cash Fee of Aggregate Purchase Price</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_PlacementAgencyAgreementCashFeeOfAggregatePurchasePrice_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Placement Agency Agreement, Cash Fee of Aggregate Purchase Price</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_BepoWarrantsAndBepoAgentWarrantLiabilitiesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">BEPO warrants and BEPO agent warrant liabilities.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_BepoWarrantsAndBepoAgentWarrantLiabilitiesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">BEPO Warrants and BEPO Agent Warrant Liabilities [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_BepoWarrantsAndBepoAgentWarrantLiabilitiesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">BEPO Warrants and BEPO Agent Warrant liabilities [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_LongTermDebtExcludingCurrentMaturities_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Long-Term Debt, Excluding Current Maturities</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_LongTermDebtExcludingCurrentMaturities_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Long-Term Debt, Excluding Current Maturities</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_LongTermDebtExcludingCurrentMaturities_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Long-term debt&#8201;&#8211;&#8201;less current portion</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PrepaidExpenseAndOtherAssetsCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Prepaid Expense and Other Assets, Current</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PrepaidExpenseAndOtherAssetsCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Prepaid expenses and other current assets</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PrepaidExpenseAndOtherAssetsCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Total</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PrepaidExpenseAndOtherAssetsCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Prepaid expenses and other current assets</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeited in Period</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel">Cancelled (in shares)</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SupplementalBalanceSheetDisclosuresTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Supplemental Balance Sheet Disclosures [Text Block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SupplementalBalanceSheetDisclosuresTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Balance Sheet Components</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SalesRevenueNetMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Revenue Benchmark [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SalesRevenueNetMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Total Revenue</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NumberOfOperatingSegments_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Number of Operating Segments</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NumberOfOperatingSegments_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Number of operating segments</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SaleOfStockNameOfTransactionDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Sale of Stock [Domain]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_GeneralAndAdministrativeExpense_lbl" xlink:role="http://www.xbrl.org/2003/role/label">General and Administrative Expense</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_GeneralAndAdministrativeExpense_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">General and administrative</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_GeneralAndAdministrativeExpense_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">General and Administrative Expense, Total</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_TransferOfPropertyAndEquipmentNetToInventoriesNet_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Transfer of Property and Equipment Net to Inventories Net</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_TransferOfPropertyAndEquipmentNetToInventoriesNet_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Transfer of property and equipment net to inventories net.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_TransferOfPropertyAndEquipmentNetToInventoriesNet_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Transfer of property and equipment, net to inventories, net</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AdjustmentsNoncashItemsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity, Noncash Item [Abstract]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AdjustmentsNoncashItemsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Adjustments to reconcile net loss to net cash used in operating activities</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AdjustmentsNoncashItemsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Adjustments to reconcile net loss to net cash used in operating activities</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_ContingentEarnoutLiabilityPolicyPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Contingent Earnout Liability, Policy</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_ContingentEarnoutLiabilityPolicyPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Contingent Earnout Liability, Policy [Policy Text Block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_ContingentEarnoutLiabilityPolicyPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Contingent Earnout Liability</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_BusinessCombinationContingentConsiderationLiabilityNoncurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Business Combination, Contingent Consideration, Liability, Noncurrent</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_BusinessCombinationContingentConsiderationLiabilityNoncurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Contingent earnout liabilities</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_BusinessCombinationContingentConsiderationLiabilityNoncurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Contingent earnout liabilities (Note 10)</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_A2023PrivateWarrantBMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">2023 Private Warrant B</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_A2023PrivateWarrantBMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">2023 Private Warrant B [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_A2023PrivateWarrantBMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">2023 Private Warrant B [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Forfeitures and Expirations in Period</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel">Forfeited or expired (in shares)</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SubsequentEventTable_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Subsequent Event [Table]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SubsequentEventTable_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Subsequent Event [Table]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_ReserveForExcessAndObsoleteInventory_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Reserve for excess and obsolete inventory</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_ReserveForExcessAndObsoleteInventory_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Reserve For Excess And Obsolete Inventory</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_ReserveForExcessAndObsoleteInventory_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Reserve for excess and obsolete inventory.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_EquipmentOnLeaseAggregateCarryingValueReclassifiedToFinishedGoodsInventory_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Equipment on Lease, Aggregate Carrying Value, Reclassified to Finished Goods Inventory</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_EquipmentOnLeaseAggregateCarryingValueReclassifiedToFinishedGoodsInventory_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Equipment on Lease, Aggregate Carrying Value, Reclassified to Finished Goods Inventory</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_EquipmentOnLeaseAggregateCarryingValueReclassifiedToFinishedGoodsInventory_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Equipment on lease, aggregate carrying value, reclassified to finished goods inventory</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DeferredTaxAssetsOther_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Deferred Tax Assets, Other</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DeferredTaxAssetsOther_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Other timing differences</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CurrentFederalStateAndLocalTaxExpenseBenefitAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Current Federal, State and Local, Tax Expense (Benefit) [Abstract]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CurrentFederalStateAndLocalTaxExpenseBenefitAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Current</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShortTermDebtTypeDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Short-Term Debt, Type [Domain]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_UnderwritingAgreementMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Underwriting Agreement [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_UnderwritingAgreementMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Underwriting agreement</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_UnderwritingAgreementMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Underwriting Agreement</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DebtInstrumentConvertibleConversionPrice1_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Debt Instrument, Convertible, Conversion Price</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DebtInstrumentConvertibleConversionPrice1_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Conversion price</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LineOfCreditFacilityInterestRateDuringPeriod_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Line of Credit Facility, Interest Rate During Period</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LineOfCreditFacilityInterestRateDuringPeriod_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Effective interest rate (as a percent)</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_GainsLossesOnExtinguishmentOfDebt_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Gain (Loss) on Extinguishment of Debt</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_GainsLossesOnExtinguishmentOfDebt_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Loss on debt extinguishment</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_GainsLossesOnExtinguishmentOfDebt_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Gain (Loss) on Extinguishment of Debt, Total</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_GainsLossesOnExtinguishmentOfDebt_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Loss on debt extinguishment</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_GainsLossesOnExtinguishmentOfDebt_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Gain (loss) on extinguishment of debt</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_DocumentFinStmtRestatementRecoveryAnalysisFlag_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Document Financial Statement Restatement Recovery Analysis [Flag]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageExercisePrice_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Exercise Price</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageExercisePrice_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Options vested and expected to vest as of end of period (in dollars per share)</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DebtInstrumentInterestRateIncreaseDecrease_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Debt Instrument, Interest Rate, Increase (Decrease)</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DebtInstrumentInterestRateIncreaseDecrease_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Reductions of interest rate percentage</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PropertyPlantAndEquipmentUsefulLife_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Property, Plant and Equipment, Useful Life</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PropertyPlantAndEquipmentUsefulLife_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Useful life</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PropertyPlantAndEquipmentUsefulLife_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Estimated Useful Life</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShortTermDebtTypeAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Short-Term Debt, Type [Axis]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NewAccountingPronouncementsPolicyPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">New Accounting Pronouncements, Policy [Policy Text Block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NewAccountingPronouncementsPolicyPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Recently Issued Accounting Pronouncements</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NewAccountingPronouncementsPolicyPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Recently Adopted Accounting Pronouncements and Recently Issued Accounting Pronouncements</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LesseeOperatingLeaseLiabilityMaturityTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Lessee, Operating Lease, Liability, to be Paid, Maturity [Table Text Block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LesseeOperatingLeaseLiabilityMaturityTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Future Minimum Operating Lease Payments</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ContractWithCustomerLiabilityCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Contract with Customer, Liability, Current</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ContractWithCustomerLiabilityCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Contract liabilities</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_ChangeDueToExchangeOfWarrants_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Change Due to Exchange of Warrants</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_ChangeDueToExchangeOfWarrants_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Change due to exchange of warrants.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_ChangeDueToExchangeOfWarrants_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Change due to exchange of warrants</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_ChangeDueToExchangeOfWarrants_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Change due to exchange of warrants</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_OwnershipAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Ownership [Axis]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Award vesting period</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_SecuredNotesAggregatePrincipalAmountRepaid_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Secured Notes, Aggregate Principal Amount, Repaid</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_SecuredNotesAggregatePrincipalAmountRepaid_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Secured Notes, Aggregate Principal Amount, Repaid</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_SecuredNotesAggregatePrincipalAmountRepaid_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Secured notes, aggregate principal amount, repaid</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncreaseDecreaseInContractWithCustomerAsset_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Contract assets</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncreaseDecreaseInContractWithCustomerAsset_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Increase (Decrease) in Contract with Customer, Asset</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_AtTheMarketOfferingValueOfSharesSold_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">At-the-Market Offering, Value of Shares Sold</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_AtTheMarketOfferingValueOfSharesSold_lbl" xlink:role="http://www.xbrl.org/2003/role/label">At-the-Market Offering, Value of Shares Sold</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_AtTheMarketOfferingValueOfSharesSold_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">At-the-Market Offering, Value of Shares Sold</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_ContingentEarnoutLiabilityScenarioAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Contingent Earnout Liability, Scenario [Axis]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_ContingentEarnoutLiabilityScenarioAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Contingent Earnout Liability, Scenario</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_ContingentEarnoutLiabilityScenarioAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Contingent Earnout Liability, Scenario [Axis]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Income (Loss) from Continuing Operations before Income Taxes, Domestic</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">US</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncomeTaxExpenseBenefitContinuingOperationsIncomeTaxReconciliationAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Income Tax Expense (Benefit), Effective Income Tax Rate Reconciliation, Amount [Abstract]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_Depreciation_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Depreciation</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_Depreciation_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Depreciation</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_Depreciation_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Depreciation, Total</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_Depreciation_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Depreciation expense</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationsTechniqueTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Fair Value Assets and Liabilities Measured on Recurring and Nonrecurring Basis Valuations Technique [Table Text Block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationsTechniqueTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Fair value assets and liabilities measured on recurring and nonrecurring basis valuations technique.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationsTechniqueTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Schedule of Fair Value Assumptions Contingent Earnout Liabilities</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommonStockSharesOutstanding_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Common Stock, Shares, Outstanding</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommonStockSharesOutstanding_lbl" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel">Common Stock, Shares, Outstanding, Ending Balance</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommonStockSharesOutstanding_lbl" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel">Common Stock, Shares, Outstanding, Beginning Balance</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommonStockSharesOutstanding_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Common stock, shares outstanding</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_AtTheMarketOfferingNetIssuanceCost_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">At-the-Market Offering, Net Issuance Cost</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_AtTheMarketOfferingNetIssuanceCost_lbl" xlink:role="http://www.xbrl.org/2003/role/label">At-the-Market Offering, Net Issuance Cost</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_AtTheMarketOfferingNetIssuanceCost_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">At-the-Market Offering, Net Issuance Cost</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OperatingLeaseLiabilityCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Operating Lease, Liability, Current</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OperatingLeaseLiabilityCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Less current portion</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OperatingLeaseLiabilityCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Current (Accrued expense and other current liabilities)</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CollaborativeArrangementsAndNoncollaborativeArrangementTransactionsLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DepreciationDepletionAndAmortization_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Depreciation, Depletion and Amortization</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DepreciationDepletionAndAmortization_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Depreciation and amortization</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DepreciationDepletionAndAmortization_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Depreciation, Depletion and Amortization, Total</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="cyd_CybersecurityRiskManagementProcessesIntegratedFlag_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Cybersecurity Risk Management Processes Integrated [Flag]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_DocumentTransitionReport_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Document Transition Report</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_DocumentTransitionReport_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Document Transition Report</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DeferredTaxAssetsLiabilitiesNet_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Net deferred tax assets</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DeferredTaxAssetsLiabilitiesNet_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Deferred Tax Assets, Net</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShortTermInvestments_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Short-Term Investments</link:label>
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          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShortTermInvestments_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Short-Term Investments, Total</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OperatingExpenses_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Operating Expenses</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OperatingExpenses_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Operating Expenses</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OperatingExpenses_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Total operating expenses</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OperatingExpenses_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Total operating expenses</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ResearchAndDevelopmentExpense_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Research and Development Expense</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ResearchAndDevelopmentExpense_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Research and development</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ResearchAndDevelopmentExpense_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Research and Development Expense, Total</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_ValueOfSharesSoldMayOfferAndSellUpTo_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Value of Shares Sold, May Offer and Sell up to</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_ValueOfSharesSoldMayOfferAndSellUpTo_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Value of Shares Sold, May Offer and Sell up to</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_ValueOfSharesSoldMayOfferAndSellUpTo_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Value of shares sold, may offer and sell up to</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CostOfRevenue_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Cost of Revenue</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CostOfRevenue_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Cost of revenue</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CostOfRevenue_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Cost of Revenue, Total</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_OtherLiabilitiesAndLeaseLiabilitiesNoncurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Other Liabilities And Lease Liabilities, Noncurrent</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_OtherLiabilitiesAndLeaseLiabilitiesNoncurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Other Liabilities And Lease Liabilities, Noncurrent</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_OtherLiabilitiesAndLeaseLiabilitiesNoncurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Other noncurrent liabilities</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_OtherLiabilitiesAndLeaseLiabilitiesNoncurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Total other noncurrent liabilities</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfComponentsOfIncomeTaxExpenseBenefitTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfComponentsOfIncomeTaxExpenseBenefitTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Schedule of Income Tax Expense (Benefit)</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StatementOfCashFlowsAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Statement of Cash Flows [Abstract]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Weighted-Average Grant Date Fair Value</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CurrentFederalTaxExpenseBenefit_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Current Federal Tax Expense (Benefit)</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CurrentFederalTaxExpenseBenefit_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Federal</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StockIssuedDuringPeriodValueNewIssues_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Commons stock value</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StockIssuedDuringPeriodValueNewIssues_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Stock Issued During Period, Value, New Issues</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfShareBasedCompensationStockOptionsActivityTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Share-Based Payment Arrangement, Option, Activity [Table Text Block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfShareBasedCompensationStockOptionsActivityTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Stock Option Plan Activity</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_CostOfSupportServicesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Cost of Support Services</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_CostOfSupportServicesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Cost of Support Services [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_CostOfSupportServicesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Cost of Support Services</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_AprilTwoThousandAndTwentyFourSecuritiesPurchaseAgreementMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">April two thousand and twenty four securities purchase agreement.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_AprilTwoThousandAndTwentyFourSecuritiesPurchaseAgreementMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">April Two Thousand And Twenty Four Securities Purchase Agreement [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_AprilTwoThousandAndTwentyFourSecuritiesPurchaseAgreementMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">April 2024 Securities Purchase Agreement</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AssetsFairValueDisclosureAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Assets, Fair Value Disclosure [Abstract]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AssetsFairValueDisclosureAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Assets</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseShareBasedCompensationCost_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Effective Income Tax Rate Reconciliation, Nondeductible Expense, Share-Based Payment Arrangement, Percent</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseShareBasedCompensationCost_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Stock-based compensation</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseShareBasedCompensationCost_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Stock-based compensation</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseShareBasedCompensationCost_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Stock-based compensation, Percentage</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseShareBasedCompensationCost_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel">Stock-based compensation, Percentage</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StockholdersEquityNoteDisclosureTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Equity [Text Block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StockholdersEquityNoteDisclosureTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Equity Instruments</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EarningsPerShareTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Earnings Per Share [Text Block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EarningsPerShareTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Basic and Diluted Net Loss per Share</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_ScheduleOfWarrantsAndRightsRollForwardTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Schedule Of Warrants And Rights Roll Forward</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_ScheduleOfWarrantsAndRightsRollForwardTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Schedule Of Warrants And Rights Roll Forward [Table Text Block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_ScheduleOfWarrantsAndRightsRollForwardTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Warrant Liability Rollforward</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_JAWSSpitfireAcquisitionCorporationMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">JAWS Spitfire Acquisition Corporation</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_JAWSSpitfireAcquisitionCorporationMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">JAWS Spitfire Acquisition Corporation [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_JAWSSpitfireAcquisitionCorporationMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">JAWS Spitfire</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_MeasurementInputExpectedDividendRateMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Measurement Input, Expected Dividend Rate [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_MeasurementInputExpectedDividendRateMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Dividend rate</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="cyd_CybersecurityRiskManagementProcessesIntegratedTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Cybersecurity Risk Management Processes Integrated [Text Block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NetIncomeLoss_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Net loss</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NetIncomeLoss_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Net loss</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Intrinsic Value</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Aggregate intrinsic value of options outstanding</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncreaseDecreaseInInventories_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Increase (Decrease) in Inventories</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncreaseDecreaseInInventories_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Increase (Decrease) in Inventories, Total</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncreaseDecreaseInInventories_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Inventories</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AccountingChangesAndErrorCorrectionsAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Accounting Changes and Error Corrections [Abstract]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OperatingLeaseCost_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Operating Lease, Cost</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OperatingLeaseCost_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Operating lease expense</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_EffectiveIncomeTaxRateReconciliationFairValueAdjustmentsPercent_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Effective Income Tax Rate Reconciliation, Fair Value Adjustments, Percent</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_EffectiveIncomeTaxRateReconciliationFairValueAdjustmentsPercent_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Effective Income Tax Rate Reconciliation, Fair Value Adjustments, Percent</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_EffectiveIncomeTaxRateReconciliationFairValueAdjustmentsPercent_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Fair value adjustments</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_EffectiveIncomeTaxRateReconciliationFairValueAdjustmentsPercent_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Fair value adjustments</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_WarrantsAndRightsOutstandingTerm_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Warrants and Rights Outstanding, Term</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_WarrantsAndRightsOutstandingTerm_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Warrants term</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PreferredStockConvertibleSharesIssuable_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Number of common shares issuable upon conversion of preferred stock</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PreferredStockConvertibleSharesIssuable_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Preferred Stock, Convertible, Shares Issuable</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_EquipmentLoanFeesToBeAmortized_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Equipment Loan Fees To Be Amortized</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_EquipmentLoanFeesToBeAmortized_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Equipment loan fees to be amortized.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_EquipmentLoanFeesToBeAmortized_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Less: 2025 Equipment Loan fees to be amortized subsequent to December 31, 2025</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsDeferredRent_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Lease liability</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsDeferredRent_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Deferred Rent</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_BepoWarrantsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">BEPO warrants.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_BepoWarrantsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">BEPO Warrants [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_BepoWarrantsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">BEPO Warrants</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PurchaseObligation_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Purchase Obligation</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PurchaseObligation_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Purchase obligation</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AssetsAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Assets [Abstract]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AssetsAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Assets</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_LesseeLeaseLiabilityToBePaidYearFour_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Lessee, Lease, Liability, To Be Paid, Year Four</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_LesseeLeaseLiabilityToBePaidYearFour_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Lessee, Lease, Liability, To Be Paid, Year Four</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_LesseeLeaseLiabilityToBePaidYearFour_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">2029</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ConstructionInProgressMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Construction in progress</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ConstructionInProgressMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Construction in Progress [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Prepaid expenses and other current assets</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Increase (Decrease) in Prepaid Expense and Other Assets</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AmortizationOfFinancingCostsAndDiscounts_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Amortization of Debt Issuance Costs and Discounts</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AmortizationOfFinancingCostsAndDiscounts_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Amortization of debt discount and deferred financing costs</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AmortizationOfFinancingCostsAndDiscounts_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Amortization of Debt Issuance Costs and Discounts, Total</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_PublicWarrantsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">This member stands for public warrants.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_PublicWarrantsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Public Warrants [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_PublicWarrantsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Public Warrants [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_PublicWarrantsMember_lbl" xlink:role="http://www.xbrl.org/2009/role/netLabel">Public</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_DocumentFiscalYearFocus_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Document Fiscal Year Focus</link:label>
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          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Lessee, Operating Lease, Liability, to be Paid, Year One</link:label>
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          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DebtInstrumentAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Debt Instrument [Axis]</link:label>
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          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Share-Based Payment Arrangement [Abstract]</link:label>
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          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_WarrantLiabilityMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Warrant Liability [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_WarrantLiabilityMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Warrant liabilities</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AssetsFairValueDisclosure_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Assets, Fair Value Disclosure</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AssetsFairValueDisclosure_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Assets, Fair Value Disclosure</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_CurrentLeaseLiabilities_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Current lease liabilities</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_CurrentLeaseLiabilities_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Current lease liabilities.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_SecuredNotesAggregatePrincipalAmount_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Secured Notes, Aggregate Principal Amount</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_SecuredNotesAggregatePrincipalAmount_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Secured Notes, Aggregate Principal Amount</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_SecuredNotesAggregatePrincipalAmount_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Secured notes, aggregate principal amount</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SubsidiarySaleOfStockAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Sale of Stock [Axis]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ConcentrationRiskPercentage1_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Concentration Risk, Percentage</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ConcentrationRiskPercentage1_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Concentration risk, percentage</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfNonvestedRestrictedStockUnitsActivityTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Schedule of Nonvested Restricted Stock Units Activity [Table Text Block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfNonvestedRestrictedStockUnitsActivityTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Schedule of Nonvested Restricted Stock Units Activity</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_Revenues_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Revenue</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_Revenues_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Total Revenue</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_Revenues_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Revenues</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_LesseeOperatingLeaseAreaOfProperty_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Lessee, Operating Lease, Area Of Property</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_LesseeOperatingLeaseAreaOfProperty_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Lessee, Operating Lease, Area Of Property</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_LesseeOperatingLeaseAreaOfProperty_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Area of property intended to be leased</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NetCashProvidedByUsedInInvestingActivities_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Cash Provided by (Used in) Investing Activity, Including Discontinued Operation</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NetCashProvidedByUsedInInvestingActivities_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Net cash (used in) provided by investing activities</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_SalesTypeLeasingMonthlyPaymentsAndIncludedPurchaseOptionAtEndOfCompletionOfTheInitialTerm_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Sales Type Leasing Monthly Payments and included Purchase Option at End of Completion of the Initial Term</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_SalesTypeLeasingMonthlyPaymentsAndIncludedPurchaseOptionAtEndOfCompletionOfTheInitialTerm_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Sales type leasing monthly payments and included purchase option at end of completion of the initial term</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_SalesTypeLeasingMonthlyPaymentsAndIncludedPurchaseOptionAtEndOfCompletionOfTheInitialTerm_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Monthly payments</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PrivatePlacementMember_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Private Placement</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PrivatePlacementMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Private Placement [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_GainOnExchangeOfDebtForCommonStock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Gain On Exchange Of Debt For Common Stock</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_GainOnExchangeOfDebtForCommonStock_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Gain on exchange of debt for common stock.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_GainOnExchangeOfDebtForCommonStock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Gain on exchange of debt for common stock</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_GainOnExchangeOfDebtForCommonStock_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Gain on exchange of debt for common stock</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FinanceLeaseWeightedAverageRemainingLeaseTerm1_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Finance Lease, Weighted Average Remaining Lease Term</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FinanceLeaseWeightedAverageRemainingLeaseTerm1_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Weighted - average remaining lease term - financing leases (years)</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_Security12bTitle_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Title of 12(b) Security</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_Security12bTitle_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Title of 12(b) Security</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DeferredTaxLiabilitiesNetAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Deferred Tax Liabilities, Net [Abstract]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DeferredTaxLiabilitiesNetAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Deferred tax liabilities</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PropertySubjectToOrAvailableForOperatingLeaseGross_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Property, Plant, and Equipment, Lessor Asset under Operating Lease, before Accumulated Depreciation</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PropertySubjectToOrAvailableForOperatingLeaseGross_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Total Equipment subject to operating lease</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Stock based compensation</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Effective Income Tax Rate Reconciliation, Nondeductible Expense, Share-Based Payment Arrangement, Amount</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_Customer7Member_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Customer 7</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_Customer7Member_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Customer 7 [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_Customer7Member_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Customer 7.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Cancelled (in dollars per share)</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_GrossProceedsFromAugustTwoThousandTwentyFiveOffering_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Gross Proceeds From August Two Thousand Twenty Five Offering</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_GrossProceedsFromAugustTwoThousandTwentyFiveOffering_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Gross proceeds from august two thousand twenty five offering.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_GrossProceedsFromAugustTwoThousandTwentyFiveOffering_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Gross proceeds from August 2025 Offering</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_SecuritiesPurchaseAgreementRepaymentPrice_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Securities Purchase Agreement, Repayment Price</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_SecuritiesPurchaseAgreementRepaymentPrice_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Securities Purchase Agreement, Repayment Price</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_SecuritiesPurchaseAgreementRepaymentPrice_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Securities purchase agreement, repayment price</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncomeTaxDisclosureTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Income Tax Disclosure [Text Block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncomeTaxDisclosureTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Income Taxes</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfCollaborativeArrangementsAndNoncollaborativeArrangementTransactionsTable_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Collaborative Arrangement and Arrangement Other than Collaborative [Table]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ClassOfWarrantOrRightLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Class of Warrant or Right [Line Items]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ClassOfWarrantOrRightLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Class of Warrant or Right [Line Items]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_NonCashCostOfIssuanceOfCommonStockWarrantsOnBepoOffering_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Non-cash cost of issuance of common stock warrants on BEPO Offering</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_NonCashCostOfIssuanceOfCommonStockWarrantsOnBepoOffering_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Non-cash cost of issuance of common stock warrants on BEPO Offering</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_NonCashCostOfIssuanceOfCommonStockWarrantsOnBepoOffering_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Non-cash cost of issuance of common stock warrants on BEPO Offering</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_DocumentInformationTable_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Document Information [Table]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_DocumentInformationTable_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Document Information [Table]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherLiabilitiesNoncurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Other Liabilities, Noncurrent</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherLiabilitiesNoncurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Other noncurrent liabilities</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FinanceLeaseRightOfUseAsset_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Finance Lease, Right-of-Use Asset, after Accumulated Amortization</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FinanceLeaseRightOfUseAsset_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Finance Lease, Right-of-Use Asset, after Accumulated Amortization, Total</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FinanceLeaseRightOfUseAsset_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Equipment subject to operating lease, net</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_LegalEntityAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Legal Entity [Axis]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_LegalEntityAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Legal Entity [Axis]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Changes in assets and liabilities</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity, Increase (Decrease) in Operating Capital [Abstract]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PropertyPlantAndEquipmentTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Schedule of Property and Equipment, Net</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PropertyPlantAndEquipmentTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Property, Plant and Equipment [Table Text Block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Exercise Price</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice_lbl" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel">Outstanding as of end of period (in dollars per share)</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice_lbl" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel">Outstanding as of beginning of period (in dollars per share)</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SalesTypeLeaseNetInvestmentInLease_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Net investment in sales type lease</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SalesTypeLeaseNetInvestmentInLease_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Sales-Type Lease, Net Investment in Lease, before Allowance for Credit Loss</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SalesTypeLeaseNetInvestmentInLease_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Sales-Type Lease, Net Investment in Lease, before Allowance for Credit Loss, Total</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncomeTaxDisclosureAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Income Tax Disclosure [Abstract]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_UnrecognizedTaxBenefits_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Unrecognized Tax Benefits</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_UnrecognizedTaxBenefits_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Uncertain tax benefits</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_UnrecognizedTaxBenefits_lbl" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel">Balance at beginning of year</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_UnrecognizedTaxBenefits_lbl" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel">Balance at end of year</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AdditionalPaidInCapitalMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Additional Paid-in Capital [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AdditionalPaidInCapitalMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Additional Paid-in Capital [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncreaseDecreaseInAccruedLiabilitiesAndOtherOperatingLiabilities_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Accrued expenses and other liabilities</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncreaseDecreaseInAccruedLiabilitiesAndOtherOperatingLiabilities_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Increase (Decrease) in Accrued Liabilities and Other Operating Liabilities</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_EquipmentOnLease_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Equipment on Lease</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_EquipmentOnLease_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Equipment on Lease</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_EquipmentOnLease_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Equipment on lease</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FairValueMeasurementFrequencyDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Measurement Frequency [Domain]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_UnpaidInventoryPurchase_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Unpaid Inventory Purchase</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_UnpaidInventoryPurchase_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Unpaid inventory purchase.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_UnpaidInventoryPurchase_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Unpaid purchase of inventories, net</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OperatingLeaseLiabilityNoncurrentStatementOfFinancialPositionExtensibleList_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OperatingLeaseLiabilityNoncurrentStatementOfFinancialPositionExtensibleList_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncomeStatementLocationAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Income Statement Location [Axis]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncomeStatementLocationAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Income Statement Location [Axis]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ChangeInAccountingPrincipleAccountingStandardsUpdateAdoptionDate_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Change in Accounting Principle, Accounting Standards Update, Adoption Date</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ChangeInAccountingPrincipleAccountingStandardsUpdateAdoptionDate_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Change in Accounting Principle, Accounting Standards Update, Adoption Date</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_SalesTypeLeaseHavingEffectiveInterestRate_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Sales Type Lease having Effective Interest Rate</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_SalesTypeLeaseHavingEffectiveInterestRate_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Sales type lease having effective interest rate</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_SalesTypeLeaseHavingEffectiveInterestRate_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Effective interest rate</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_TradingSymbol_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Trading Symbol</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_TradingSymbol_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Trading Symbol</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_ReimbursementOfPreviouslyIncurredLeaseholdExpenditures_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Reimbursement of previously incurred leasehold expenditures</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_ReimbursementOfPreviouslyIncurredLeaseholdExpenditures_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Reimbursement of Previously Incurred Leasehold Expenditures</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_ReimbursementOfPreviouslyIncurredLeaseholdExpenditures_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Reimbursement of previously incurred leasehold expenditures.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_DirectorMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Director [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_DirectorMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Director</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SubsequentEventTypeAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Subsequent Event Type [Axis]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SubsequentEventTypeAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Subsequent Event Type [Axis]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_InterestPayments_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Interest payment</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_InterestPayments_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Interest Payments</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_InterestPayments_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Interest payments.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_RestatementAdjustmentMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Adjusted</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_RestatementAdjustmentMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Revision of Prior Period, Adjustment [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EmployeeRelatedLiabilitiesCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Employee-related Liabilities, Current</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EmployeeRelatedLiabilitiesCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Accrued salaries and benefits</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Cash Provided by (Used in) Financing Activity, Including Discontinued Operation [Abstract]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Cash flows from financing activities</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FairValueMeasurementsRecurringMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Fair Value, Recurring</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FairValueMeasurementsRecurringMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Fair Value, Recurring [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityExTransitionPeriod_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Entity Ex Transition Period</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityExTransitionPeriod_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Entity Ex Transition Period</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Schedule of Equity Method Investments [Line Items]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfPropertySubjectToOrAvailableForOperatingLeaseTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Property, Plant, and Equipment, Lessor Asset under Operating Lease [Table Text Block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfPropertySubjectToOrAvailableForOperatingLeaseTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Schedule of Equipment Subject to Operating Lease</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Lessee, Operating Lease, Liability, to be Paid</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Total operating lease payments</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_A2014StockOptionPlanMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">2014 Stock Option Plan</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_A2014StockOptionPlanMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">2014 Stock Option Plan [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_A2014StockOptionPlanMember_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">2014 Plan</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_AtTheMarketOfferingTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">At-the-Market Offering</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_AtTheMarketOfferingTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">At-the-Market Offering [Text Block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_AtTheMarketOfferingTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">At-the-Market Offering</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Fair Value Measurement Inputs and Valuation Techniques [Line Items]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Fair Value Measurement Inputs and Valuation Techniques [Line Items]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SellingAndMarketingExpense_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Selling and Marketing Expense</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SellingAndMarketingExpense_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Selling and marketing</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SellingAndMarketingExpense_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Selling and Marketing Expense, Total</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_ThienemanConstructionIncMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Thieneman Construction, Inc. [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_ThienemanConstructionIncMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Thieneman Construction, Inc.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_ThienemanConstructionIncMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Thieneman Construction, Inc.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StatementEquityComponentsAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Equity Components [Axis]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StatementEquityComponentsAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Equity Components [Axis]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_WarrantRedemptionScenarioOneMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Contingent Earnout Liability, Scenario One</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_WarrantRedemptionScenarioOneMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Warrant Redemption, Scenario One [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_WarrantRedemptionScenarioOneMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Contingent Earnout Liability, Scenario One</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EquityComponentDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Equity Component [Domain]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EquityComponentDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Equity Component [Domain]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_DocumentAnnualReport_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Document Annual Report</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_DocumentAnnualReport_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Document Annual Report</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_BusinessAcquisitionAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Business Combination [Axis]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_BusinessAcquisitionAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Business Acquisition [Axis]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PrepaidInsurance_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Prepaid Insurance</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PrepaidInsurance_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Prepaid insurance and other</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_MajorCustomersAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Customer [Axis]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_MajorCustomersAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Customer [Axis]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_ScheduleOfDeferredTaxAssetsPreviouslyIssuedTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Schedule of Deferred Tax Assets Previously Issued</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_ScheduleOfDeferredTaxAssetsPreviouslyIssuedTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Schedule Of Deferred Tax Assets Previously Issued [TableText Block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_ScheduleOfDeferredTaxAssetsPreviouslyIssuedTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Schedule of deferred tax assets previously issued.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardExpirationPeriod_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Period</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardExpirationPeriod_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Award expiration period</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_SecuredNoteDueTwoThousandTwentySixMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Secured Note due 2026</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_SecuredNoteDueTwoThousandTwentySixMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Secured Note Due Two Thousand Twenty Six [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_SecuredNoteDueTwoThousandTwentySixMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Secured note due two thousand twenty six.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_MaximumMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Maximum [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_MaximumMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Maximum</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_DebtInstrumentInterestToBeAccrued_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Debt Instrument, Interest To Be Accrued</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_DebtInstrumentInterestToBeAccrued_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Debt instrument, interest to be accrued.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_DebtInstrumentInterestToBeAccrued_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Less: Amount of interest to be accrued subsequent to December 31, 2025</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_DebtInstrumentInterestToBeAccrued_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Less: Amount of interest to be accrued subsequent to December 31, 2025</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfStockByClassTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Schedule of Stock by Class [Table Text Block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfStockByClassTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Schedule of Shares of Common Stock Reserved for Issuance</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_RangeAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Statistical Measurement [Axis]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_RangeAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Statistical Measurement [Axis]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Exercised (in dollars per share)</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_PaymentOfLongTermDebtExcludingConvertibleDebt_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Payment Of Long Term Debt, Excluding Convertible Debt</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_PaymentOfLongTermDebtExcludingConvertibleDebt_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Payment of long-term debt, excluding convertible debt.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_PaymentOfLongTermDebtExcludingConvertibleDebt_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Issuance cost for equipment loan</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommonStockValue_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Common Stock, Value, Issued</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommonStockValue_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Common stock, $0.00001 par value - 500,000,000 shares authorized at December 31, 2023 and 2022, respectively, 7,383,390 and 5,358,896 shares issued and outstanding as of December 31, 2023 and 2022, respectively</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommonStockValue_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Common stock, $0.00001 par value - 500,000,000 shares authorized at December 31, 2025 and 2024, respectively, 24,607,630 and 12,993,962 shares issued and outstanding as of December 31, 2025 and 2024, respectively</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_WarrantsAndRightsOutstanding_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Warrants and Rights Outstanding</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_WarrantsAndRightsOutstanding_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Warrant liabilities</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_WarrantsAndRightsOutstanding_lbl" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel">Beginning Balance</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_WarrantsAndRightsOutstanding_lbl" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel">Ending Balance</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_WarrantsAndRightsOutstanding_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Warrant liabilities (Note 10)</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_EffectiveIncomeTaxRateReconciliationSectionThreeEightyTwoLimitationPercent_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Section 382 Limitation</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_EffectiveIncomeTaxRateReconciliationSectionThreeEightyTwoLimitationPercent_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Effective Income Tax Rate Reconciliation, Section Three Eighty Two Limitation, Percent</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_EffectiveIncomeTaxRateReconciliationSectionThreeEightyTwoLimitationPercent_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Effective Income Tax Rate Reconciliation, Section Three Eighty Two Limitation, Percent.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_EffectiveIncomeTaxRateReconciliationSectionThreeEightyTwoLimitationPercent_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Section 382 Limitation</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_PercentageOfRevenueWithVariableConsideration_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Percentage of Revenue With Variable Consideration</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_PercentageOfRevenueWithVariableConsideration_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Percentage of revenue with variable consideration.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_PercentageOfRevenueWithVariableConsideration_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Percentage of revenue with variable consideration</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_IssuanceOfCommonStockInConnectionWithDebtExtinguishment_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Issuance of common stock in connection with debt extinguishment</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_IssuanceOfCommonStockInConnectionWithDebtExtinguishment_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Issuance of common stock in connection with debt extinguishment</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_IssuanceOfCommonStockInConnectionWithDebtExtinguishment_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Issuance of common stock in connection with debt extinguishment</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ConvertibleNotesPayableCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Convertible Notes Payable, Current</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ConvertibleNotesPayableCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Senior secured convertible promissory note</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DeferredTaxAssetsOperatingLossCarryforwards_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Deferred Tax Assets, Operating Loss Carryforwards</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DeferredTaxAssetsOperatingLossCarryforwards_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Deferred Tax Assets, Operating Loss Carryforwards, Total</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DeferredTaxAssetsOperatingLossCarryforwards_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Net operating losses</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DeferredTaxAssetsOperatingLossCarryforwards_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Net operating loss carryforwards</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="cyd_CybersecurityRiskManagementProcessesForAssessingIdentifyingAndManagingThreatsTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Cybersecurity Risk Management Processes for Assessing, Identifying, and Managing Threats [Text Block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_TaxCreditCarryforwardAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Tax Credit Carryforward [Axis]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_SharesIssuedSharesShareBasedPaymentArrangementDebtExinguishment_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Shares Issued, Shares, Share-Based Payment Arrangement, Debt Exinguishment</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_SharesIssuedSharesShareBasedPaymentArrangementDebtExinguishment_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Shares Issued, Shares, Share-Based Payment Arrangement, Debt Exinguishment</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_SharesIssuedSharesShareBasedPaymentArrangementDebtExinguishment_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Issuance of common stock in connection with debt extinguishment (in shares)</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ImpairmentOrDisposalOfLongLivedAssetsPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Impairment or Disposal of Long-Lived Assets, Policy [Policy Text Block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ImpairmentOrDisposalOfLongLivedAssetsPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Impairment of Long-Lived Assets</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Other Comprehensive Income (Loss), Available-for-Sale Securities Adjustment, Net of Tax, Portion Attributable to Parent</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Other Comprehensive Income (Loss), Available-for-Sale Securities Adjustment, Net of Tax, Portion Attributable to Parent, Total</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Net unrealized holding gain (loss) on available-for-sale investments</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Net unrealized holding gain on available-for-sale investments</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_PercentageOfOriginalCostOfEquipment_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Percentage Of Original Cost Of Equipment</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_PercentageOfOriginalCostOfEquipment_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Percentage of original cost of equipment.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_PercentageOfOriginalCostOfEquipment_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Percentage of original cost of equipment</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">State, net of federal benefit</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">State, net of federal benefit</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">State, net of federal benefit, Percentage</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel">State, net of federal benefit, Percentage</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_DebtInstrumentRedemptionPaymentStartDate_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Debt instrument, redemption payment, start date</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_DebtInstrumentRedemptionPaymentStartDate_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Debt Instrument, Redemption Payment, Start Date</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_DebtInstrumentRedemptionPaymentStartDate_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Redemption payment, start date</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_GainLossOnFairValueOfWarrants_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Gain (Loss) On Fair Value Of Warrants</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_GainLossOnFairValueOfWarrants_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Gain (Loss) On Fair Value Of Warrants</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_GainLossOnFairValueOfWarrants_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Gain on fair value of warrants</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_GainLossOnFairValueOfWarrants_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">(Loss) gain on fair value of warrants</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityPublicFloat_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Entity Public Float</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityPublicFloat_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Entity Public Float</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_GainLossOnDebtExtinguishmentIncludingNetOfGainOnExchangeOfDebtForCommonStock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Gain (Loss) on debt extinguishment including net of Gain on exchange of debt for common stock</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_GainLossOnDebtExtinguishmentIncludingNetOfGainOnExchangeOfDebtForCommonStock_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Gain (Loss) on debt extinguishment including net of Gain on exchange of debt for common stock.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_GainLossOnDebtExtinguishmentIncludingNetOfGainOnExchangeOfDebtForCommonStock_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Loss on debt extinguishment</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_A3DPrintersMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">3D Printers [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_A3DPrintersMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">3D Printers</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_A3DPrintersMember_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">3D Printer</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_A3DPrintersMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">3D Printers</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_OperatingExpensesPolicyPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Operating Expenses, Policy</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_OperatingExpensesPolicyPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Operating Expenses, Policy [Policy Text Block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_OperatingExpensesPolicyPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Operating Expenses</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DebtInstrumentAnnualPrincipalPayment_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Debt Instrument, Annual Principal Payment</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DebtInstrumentAnnualPrincipalPayment_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Principal payments</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EmployeeStockMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Employee Stock [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EmployeeStockMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Reserved for employee stock purchase plan</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RevenueFromContractWithCustomerTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Revenue from Contract with Customer [Text Block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RevenueFromContractWithCustomerTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Revenue</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityRegistrantName_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Entity Registrant Name</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityRegistrantName_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Entity Registrant Name</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued, Total</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Accrued interest and penalties related to uncertain tax positions</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DebtDisclosureTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Debt Disclosure [Text Block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DebtDisclosureTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Long-Term Debt</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityVoluntaryFilers_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Entity Voluntary Filers</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityVoluntaryFilers_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Entity Voluntary Filers</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CustomerConcentrationRiskMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Customer Concentration Risk [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CustomerConcentrationRiskMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Customer Concentration Risk</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationTable_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationTable_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherNonoperatingIncomeExpense_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Other Nonoperating Income (Expense)</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherNonoperatingIncomeExpense_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Other income (expense), net</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherNonoperatingIncomeExpense_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Other Nonoperating Income (Expense), Total</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherNonoperatingIncomeExpense_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Other income, net</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AdditionalPaidInCapital_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Additional Paid in Capital</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AdditionalPaidInCapital_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Additional paid-in capital</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AdditionalPaidInCapital_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Additional Paid in Capital, Total</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_LesseeLeaseLiabilityToBePaidYearOne_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">2026</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_LesseeLeaseLiabilityToBePaidYearOne_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Lessee, Lease, Liability, To Be Paid, Year One</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_LesseeLeaseLiabilityToBePaidYearOne_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Lessee, Lease, Liability, To Be Paid, Year One</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_LesseeLeaseLiabilityToBePaidYearOne_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">2025</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Deferred State and Local Income Tax Expense (Benefit)</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">State</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ConversionOfStockSharesIssued1_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Conversion of stock, shares issued</link:label>
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          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SubsequentEventsAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Subsequent Events [Abstract]</link:label>
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          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncomeTaxExpenseBenefit_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Income Tax Expense (Benefit)</link:label>
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          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncomeTaxExpenseBenefit_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Total provision for income taxes</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncomeTaxExpenseBenefit_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel">(Provision) benefit for income taxes</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FairValueByMeasurementFrequencyAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Measurement Frequency [Axis]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_AssetsAndLiabilitiesLesseeTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Assets And Liabilities, Lessee</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_AssetsAndLiabilitiesLesseeTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Assets And Liabilities, Lessee [Table Text Block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_AssetsAndLiabilitiesLesseeTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Assets and Liabilities</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_SalesOfAvailableForSaleSecurities_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Sales of available for sale securities.</link:label>
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          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_AugustTwoThousandTwentyFiveOfferingMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">August Two Thousand Twenty Five Offering [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_AugustTwoThousandTwentyFiveOfferingMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">August 2025 Offering</link:label>
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          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_FebruaryNoteMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">February note member.</link:label>
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          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_PlacementAgentWarrantsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Placement Agent Warrants [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_PlacementAgentWarrantsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Placement agent warrants.</link:label>
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          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_LesseeLeaseLiabilityUndiscountedExcessAmount_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Lessee, Lease, Liability, Undiscounted Excess Amount</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_LesseeLeaseLiabilityUndiscountedExcessAmount_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Lessee, Lease, Liability, Undiscounted Excess Amount</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_LesseeLeaseLiabilityUndiscountedExcessAmount_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Less portion representing imputed interest</link:label>
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          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_DecemberTwoThousandTwentyFivePIPEFinancingMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">December two thousand twenty five pipe financing member.</link:label>
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          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Granted (in shares)</link:label>
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          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Property, Plant and Equipment [Table]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Property, Plant and Equipment [Table]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LesseeFinanceLeasesTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Lessee, Finance Leases [Text Block]</link:label>
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          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueForfeited_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Share-Based Compensation Arrangement By Share-Based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Forfeited</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueForfeited_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel">Cancelled</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncomeStatementAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Income Statement [Abstract]</link:label>
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          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_IssuanceOfCommonStockInConnectionWithCapitalRaiseNetOfIssuanceCosts_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Issuance of common stock and warrants in connection with capital raise, net of issuance costs</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_DebtForEquityExchangeMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Debt for equity exchange.</link:label>
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          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_DebtForEquityExchangeMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Debt For Equity Exchange</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueOutstanding_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Outstanding</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueOutstanding_lbl" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel">Balance as of end of period</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueOutstanding_lbl" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel">Balance as of beginning of period</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationOptionAndIncentivePlansPolicy_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Share-Based Payment Arrangement [Policy Text Block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationOptionAndIncentivePlansPolicy_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Stock-based Compensation</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_SecuritiesPurchaseAgreementAggregatePrincipalAmountOfNotesPartialRedemption_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Securities Purchase Agreement, Aggregate Principal Amount of Notes, Partial Redemption</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_SecuritiesPurchaseAgreementAggregatePrincipalAmountOfNotesPartialRedemption_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Securities Purchase Agreement, Aggregate Principal Amount of Notes, Partial Redemption</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_SecuritiesPurchaseAgreementAggregatePrincipalAmountOfNotesPartialRedemption_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Securities purchase agreement, aggregate principal amount of notes, partial redemption</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DeferredIncomeTaxExpenseBenefit_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Deferred Income Tax Expense (Benefit)</link:label>
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          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_AnnualInternalRevenueCodePreOwnershipChangeUtilizedEachYearValue_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Pre ownership change utilized each year value</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Sale of Stock, Number of Shares Issued in Transaction</link:label>
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          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel">Released (in shares)</link:label>
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          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EarningsPerShareDiluted_lbl" xlink:role="http://www.xbrl.org/2009/role/netLabel">Diluted (in shares)</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EarningsPerShareDiluted_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Net income (loss) per share Diluted</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EarningsPerShareDiluted_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Net income (loss) per share Diluted</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_ReverseStockSplitRatio_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Reverse stock split ratio.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_ReverseStockSplitRatio_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Reverse Stock Split Ratio</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_ReverseStockSplitRatio_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Reverse stock split ratio</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfErrorCorrectionsAndPriorPeriodAdjustmentRestatementTable_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Error Correction [Table]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EffectiveIncomeTaxRateContinuingOperationsTaxRateReconciliationAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Effective Income Tax Rate Reconciliation, Percent [Abstract]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_Security12gTitle_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Title of 12(g) Security</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_TitleOfIndividualWithRelationshipToEntityDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Title and Position [Domain]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_CityAreaCode_lbl" xlink:role="http://www.xbrl.org/2003/role/label">City Area Code</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_CityAreaCode_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">City Area Code</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_RecurringPaymentMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Recurring Payment</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_RecurringPaymentMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Recurring Payment [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_RecurringPaymentMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Recurring payment</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_AuditorName_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Auditor Name</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_AuditorName_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Auditor Name</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FinanceLeaseLiabilityNoncurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Finance Lease, Liability, Noncurrent</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FinanceLeaseLiabilityNoncurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Noncurrent (Other noncurrent liabilities)</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FinanceLeaseLiabilityNoncurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Long-term portion</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DebtInstrumentFaceAmount_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Debt Instrument, Face Amount</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DebtInstrumentFaceAmount_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Securities Purchase Agreement, Aggregate Principal Amount of Notes</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DebtInstrumentFaceAmount_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Debt instrument, face amount</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_DebtInstrumentRedemptionPaymentExtendedPeriodStartDate_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Debt instrument, redemption Payment extended period, start date.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_DebtInstrumentRedemptionPaymentExtendedPeriodStartDate_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Debt Instrument, Redemption Payment Extended Period, Start Date</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_DebtInstrumentRedemptionPaymentExtendedPeriodStartDate_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Redemption extended payment period, start date</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_LongTermLeaseLiabilities_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Long term lease liabilities</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_LongTermLeaseLiabilities_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Long term lease liabilities.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LessorSalesTypeLeaseTermOfContract1_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Contract term</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LessorSalesTypeLeaseTermOfContract1_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Lessor, Sales-type Lease, Term of Contract</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_FairValueOfCommonStockIssuedInExchangeTransaction_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Fair Value of Common Stock Issued in Exchange Transaction</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_FairValueOfCommonStockIssuedInExchangeTransaction_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Fair value of common stock issued in exchange transaction.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_FairValueOfCommonStockIssuedInExchangeTransaction_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Fair value of common stock issued in exchange transaction</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueVested_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Vested</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueVested_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Released</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OperatingLeaseWeightedAverageRemainingLeaseTerm1_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Operating Lease, Weighted Average Remaining Lease Term</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OperatingLeaseWeightedAverageRemainingLeaseTerm1_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Weighted - average remaining lease term - operating leases (years)</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardGross_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Stock Issued During Period, Shares, Restricted Stock Award, Gross</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardGross_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Issuance of common stock upon vesting of RSUs (in shares)</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LeaseCost_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Lease, Cost</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LeaseCost_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Total lease expense</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_PlacementAgentWarrantsPercentOfferingPrice_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Placement Agent Warrants, Percent, Offering Price</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_PlacementAgentWarrantsPercentOfferingPrice_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Placement Agent Warrants, Percent, Offering Price</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_PlacementAgentWarrantsPercentOfferingPrice_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Placement Agent Warrants, Percent, Offering Price Per Share</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LetterOfCreditMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Letter of Credit [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LetterOfCreditMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Letter of Credit</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_LeaseLiability_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Lease, Liability</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_LeaseLiability_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Lease, Liability</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_LeaseLiability_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Total lease liabilities</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_EquipmentForLeaseToCustomersReturnedToInventory_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Equipment for lease to customers returned to inventory</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_EquipmentForLeaseToCustomersReturnedToInventory_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Equipment for lease to customers returned to inventory</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_EquipmentForLeaseToCustomersReturnedToInventory_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Equipment for lease to customers returned to inventory</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_PlacementAgencyAgreementMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Placement Agency Agreement</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_PlacementAgencyAgreementMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Placement Agency Agreement [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_PlacementAgencyAgreementMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Placement Agency Agreement</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LongTermDebtPercentageBearingVariableInterestRate_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Long-Term Debt, Percentage Bearing Variable Interest, Percentage Rate</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LongTermDebtPercentageBearingVariableInterestRate_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Variable rate (as a percent)</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_CustomerDepositNoncashConsideration_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Customer Deposit Noncash Consideration</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_CustomerDepositNoncashConsideration_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Customer deposit noncash consideration.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_CustomerDepositNoncashConsideration_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Customer deposit - noncash consideration</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PropertyPlantAndEquipmentNet_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Property, Plant and Equipment, Net</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PropertyPlantAndEquipmentNet_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Property and equipment, net</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PropertyPlantAndEquipmentNet_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Property, plant and equipment, net</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PropertyPlantAndEquipmentNet_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Equipment subject to operating lease, net</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_Customer6Member_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Customer 6</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_Customer6Member_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Customer 6 [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_Customer6Member_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Customer 6</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DeferredForeignIncomeTaxExpenseBenefit_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Foreign</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DeferredForeignIncomeTaxExpenseBenefit_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Deferred Foreign Income Tax Expense (Benefit)</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_SupportServicesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Support Services</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_SupportServicesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Support Services [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_SupportServicesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Support services</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableNumber_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested and Expected to Vest, Exercisable, Number</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableNumber_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Vested and exercisable as of end of period (in shares)</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OperatingIncomeLoss_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Operating Income (Loss)</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OperatingIncomeLoss_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Operating Income (Loss)</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OperatingIncomeLoss_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Loss from operations</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OperatingIncomeLoss_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Loss from operations</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RetainedEarningsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Retained Earnings [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RetainedEarningsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Retained Earnings [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_ContingentConsiderationLiabilityEarnoutPeriodStockPriceTrigger_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Contingent Consideration, Liability, Earnout Period, Stock Price Trigger</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_ContingentConsiderationLiabilityEarnoutPeriodStockPriceTrigger_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Contingent Consideration, Liability, Earnout Period, Stock Price Trigger</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_ContingentConsiderationLiabilityEarnoutPeriodStockPriceTrigger_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Share price trigger (in usd per share)</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensation_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Share-Based Payment Arrangement, Noncash Expense</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensation_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Stock-based compensation</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensation_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Share-Based Payment Arrangement, Noncash Expense, Total</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_MeasurementInputPriceVolatilityMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Expected volatility</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_MeasurementInputPriceVolatilityMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Measurement Input, Price Volatility [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_GrossProceedsFromDecemberTwoThousandTwentyFivePIPEOffering_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Gross Proceeds From December Two Thousand Twenty Five PIPE Offering</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_GrossProceedsFromDecemberTwoThousandTwentyFivePIPEOffering_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Gross proceeds from December two thousand twenty five PIPE offering.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_GrossProceedsFromDecemberTwoThousandTwentyFivePIPEOffering_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Gross proceeds from December 2025 PIPE Offering</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_FinanceLeaseLiabilityToBePaidAfterYearFour_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Thereafter</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_FinanceLeaseLiabilityToBePaidAfterYearFour_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Finance Lease, Liability, to be Paid, after Year Four</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_FinanceLeaseLiabilityToBePaidAfterYearFour_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Finance lease, liability, to be paid, after year four.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OperatingLeaseWeightedAverageDiscountRatePercent_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Operating Lease, Weighted Average Discount Rate, Percent</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OperatingLeaseWeightedAverageDiscountRatePercent_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Weighted - average discount rate - operating leases</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OperatingLeaseLiabilityNoncurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Operating Lease, Liability, Noncurrent</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OperatingLeaseLiabilityNoncurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Long-term portion</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OperatingLeaseLiabilityNoncurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Noncurrent (Other noncurrent liabilities)</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FairValueInputsLevel1Member_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Fair Value, Inputs, Level 1 [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FairValueInputsLevel1Member_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Level 1</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ClassOfStockLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Class of Stock [Line Items]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ClassOfStockLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Class of Stock [Line Items]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NetCashProvidedByUsedInFinancingActivities_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Cash Provided by (Used in) Financing Activity, Including Discontinued Operation</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NetCashProvidedByUsedInFinancingActivities_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Net cash provided by financing activities</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LeaseCostTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Lease, Cost [Table Text Block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LeaseCostTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Lease-Related Balances</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_NonCashTransferOfPropertyAndEquipmentNetToInventoriesNet_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Non cash transfer of property and equipment, net to inventories, net</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_NonCashTransferOfPropertyAndEquipmentNetToInventoriesNet_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Non cash Transfer of Property and equipment, net to Inventories, net</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_NonCashTransferOfPropertyAndEquipmentNetToInventoriesNet_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Non cash transfer of property and equipment, net to inventories, net.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ChangeInAccountingPrincipleAccountingStandardsUpdateAdopted_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Change in Accounting Principle, Accounting Standards Update, Adopted [true false]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ChangeInAccountingPrincipleAccountingStandardsUpdateAdopted_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Change in Accounting Principle, Accounting Standards Update, Adopted [true false]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_IssuanceOfCommonStockWarrantInConnectionWithFinancing_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Issuance of common stock warrant in connection with financing</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_IssuanceOfCommonStockWarrantInConnectionWithFinancing_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Issuance of common stock warrant in connection with financing</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_IssuanceOfCommonStockWarrantInConnectionWithFinancing_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Issuance of common stock warrant in connection with financing</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_AuditorLocation_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Auditor Location</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_AuditorLocation_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Auditor Location</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfStockholdersEquityNoteWarrantsOrRightsTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Schedule of Stockholders' Equity Note, Warrants or Rights [Table Text Block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfStockholdersEquityNoteWarrantsOrRightsTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Schedule of Warrants for Shares of Stock</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_WarrantInducementAgreementMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Warrant inducement agreement.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_WarrantInducementAgreementMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Warrant Inducement Agreement [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_WarrantInducementAgreementMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Warrant Inducement Agreement [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Schedule of Potentially Dilutive Shares Excluded from Computation of Net Loss Per Share</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncomeTaxAuthorityDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Income Tax Jurisdiction [Domain]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DebtSecuritiesAvailableForSaleTable_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Debt Securities, Available-for-Sale [Table]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DebtSecuritiesAvailableForSaleTable_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Debt Securities, Available-for-sale [Table]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityInteractiveDataCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Entity Interactive Data Current</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityInteractiveDataCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Entity Interactive Data Current</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_LossOnDebtExtinguishmentUnamortizedDeferredFinancingCosts_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Loss on debt extinguishment, unamortized deferred financing costs</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_LossOnDebtExtinguishmentUnamortizedDeferredFinancingCosts_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Loss on debt extinguishment, unamortized deferred financing costs</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_LossOnDebtExtinguishmentUnamortizedDeferredFinancingCosts_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Loss on debt extinguishment, unamortized deferred financing costs</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_HighTrailHoldersMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">High Trail Holders [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_HighTrailHoldersMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">High Trail Holders</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_HighTrailHoldersMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">High Trail Holders</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncreaseDecreaseInContractWithCustomerLiability_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Increase (Decrease) in Contract with Customer, Liability</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncreaseDecreaseInContractWithCustomerLiability_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Contract liabilities</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncomeStatementLocationDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Income Statement Location [Domain]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncomeStatementLocationDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Income Statement Location [Domain]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Cash Provided by (Used in) Operating Activity, Including Discontinued Operation [Abstract]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Cash flows from operating activities</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FurnitureAndFixturesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Furniture and Fixtures [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FurnitureAndFixturesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Furniture and fixtures</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ConvertiblePreferredStockSharesIssuedUponConversion_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Convertible Preferred Stock, Shares Issued upon Conversion</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ConvertiblePreferredStockSharesIssuedUponConversion_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Convertible preferred stock, shares issued upon conversion</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DebtInstrumentPeriodicPaymentInterest_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Debt Instrument, Periodic Payment, Interest</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DebtInstrumentPeriodicPaymentInterest_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Debt instrument, interest payment</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_SecuredNotesFairMarketValue_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Secured notes, fair market value</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_SecuredNotesFairMarketValue_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Secured Notes, Fair Market Value</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_SecuredNotesFairMarketValue_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Secured Notes, Fair Market Value</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_LesseeLeaseLiabilityToBePaidAfterYearFour_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Lessee, Lease, Liability, To Be Paid, After Year Four</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_LesseeLeaseLiabilityToBePaidAfterYearFour_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Lessee, Lease, Liability, To Be Paid, After Year Four</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_LesseeLeaseLiabilityToBePaidAfterYearFour_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Thereafter</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Business Combination, Consideration Transferred, Equity Interest, Share Issued, Number of Shares</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Number of shares that the holders may receive (in shares)</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_CustomerLiabilitiesNoncashConsiderationCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Customer Liabilities Noncash Consideration Current</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_CustomerLiabilitiesNoncashConsiderationCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Customer liabilities - noncash consideration</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_CustomerLiabilitiesNoncashConsiderationCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Customer liabilities - noncash consideration current.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncreaseDecreaseInOtherNoncurrentLiabilities_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Increase (Decrease) in Other Noncurrent Liabilities</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncreaseDecreaseInOtherNoncurrentLiabilities_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Other noncurrent liabilities</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Change in fair value</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_FinanceLeaseInterestExpenseAndAmortization_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Financing lease expense</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_FinanceLeaseInterestExpenseAndAmortization_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Finance Lease, Interest Expense And Amortization</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_FinanceLeaseInterestExpenseAndAmortization_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Finance Lease, Interest Expense And Amortization</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_NewWarrantsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">New warrants.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_NewWarrantsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">New Warrants [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_NewWarrantsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">New Warrants</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SchedulesOfConcentrationOfRiskByRiskFactorTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Schedules of Concentration of Risk, by Risk Factor [Table Text Block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SchedulesOfConcentrationOfRiskByRiskFactorTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Schedules of Concentration of Risk</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_DisclosureMomentusMasterServiceAgreementAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Disclosure Momentus Master Service Agreement [Abstract]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_DisclosureMomentusMasterServiceAgreementAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Disclosure momentus master service agreement.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityTaxIdentificationNumber_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Entity Tax Identification Number</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityTaxIdentificationNumber_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Entity Tax Identification Number</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_SecuritiesPurchaseAgreementMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Securities Purchase Agreement</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_SecuritiesPurchaseAgreementMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Securities Purchase Agreement [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_SecuritiesPurchaseAgreementMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Securities Purchase Agreement</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_PlacementAgencyAgreementCertainExpensesReimburseUpTo_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Placement Agency Agreement, Certain Expenses, Reimburse up to</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_PlacementAgencyAgreementCertainExpensesReimburseUpTo_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Placement Agency Agreement, Certain Expenses, Reimburse up to</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_PlacementAgencyAgreementCertainExpensesReimburseUpTo_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Placement Agency Agreement, Certain Expenses, Reimburse up to</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SharePrice_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Share Price</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SharePrice_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Publicly traded price</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LongtermDebtTypeAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Long-Term Debt, Type [Axis]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LongtermDebtTypeAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Long-term Debt, Type [Axis]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DebtInstrumentTerm_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Debt Instrument, Term</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DebtInstrumentTerm_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Debt term</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Effect of Exchange Rate on Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Effect of exchange rate on cash and cash equivalents</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_Customer8Member_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Customer 8.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_Customer8Member_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Customer 8 [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_Customer8Member_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Customer 8</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_LocalPhoneNumber_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Local Phone Number</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_LocalPhoneNumber_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Local Phone Number</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_Velo3DMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Velo3D.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_Velo3DMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Velo3D [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_Velo3DMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Velo3D</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_PrivatePlacementWarrantsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Private Placement</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_PrivatePlacementWarrantsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Represents the information pertaining to Private Placement Warrants.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_PrivatePlacementWarrantsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Private Placement Warrants [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_PrivatePlacementWarrantsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Private Placement Warrants [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_EquipmentOnLeasePayments_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Equipment on lease payments</link:label>
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          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_AuditorOpinionTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Auditor Opinion [Text Block]</link:label>
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          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_A2021EquityIncentivePlanMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">2021 Equity Incentive Plan</link:label>
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          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFour_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">2029</link:label>
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          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityEmergingGrowthCompany_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Entity Emerging Growth Company</link:label>
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          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_JanuaryNoteMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">January note member.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="velo_JanuaryNoteMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">January Note</link:label>
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  <xsd:element id="velo_DebtInstrumentNumberOfAdvancesExecuted" name="DebtInstrumentNumberOfAdvancesExecuted" type="xbrli:integerItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="velo_OtherLiabilitiesAndLeaseLiabilitiesNoncurrent" name="OtherLiabilitiesAndLeaseLiabilitiesNoncurrent" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="velo_PercentageOfRevenueWithVariableConsideration" name="PercentageOfRevenueWithVariableConsideration" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="velo_PaymentsForIssuanceCostRelatedToDecemberTwoThousandTwentyFivePIPEOffering" name="PaymentsForIssuanceCostRelatedToDecemberTwoThousandTwentyFivePIPEOffering" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="velo_RevenueFromLicensingAgreementsInstallationAndTrainingAndOtherServices" name="RevenueFromLicensingAgreementsInstallationAndTrainingAndOtherServices" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="velo_LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFour" name="LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFour" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="velo_WarrantCancellationUponIssuanceOfCommonStock" name="WarrantCancellationUponIssuanceOfCommonStock" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="velo_EquipmentOnLeaseTotalPaymentsTableTextBlock" name="EquipmentOnLeaseTotalPaymentsTableTextBlock" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="velo_ThirdSecuredNotesMember" name="ThirdSecuredNotesMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="velo_PropertyPlantAndEquipmentUsefulLifeTableTextBlock" name="PropertyPlantAndEquipmentUsefulLifeTableTextBlock" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="velo_EffectiveIncomeTaxRateReconciliationFairValueAdjustmentsAmount" name="EffectiveIncomeTaxRateReconciliationFairValueAdjustmentsAmount" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="velo_HighbridgeHoldersAndAnsonHoldersMember" name="HighbridgeHoldersAndAnsonHoldersMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="velo_A2022PrivatePlacementWarrantsMember" name="A2022PrivatePlacementWarrantsMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="velo_SalesOfAvailableForSaleSecurities" name="SalesOfAvailableForSaleSecurities" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="velo_ArrayedNotesAcquisitionCorpMember" name="ArrayedNotesAcquisitionCorpMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="velo_ShareBasedPaymentArrangementExpensedAndCapitalizedIncludedInCostOfRevenueAmountTableTextBlock" name="ShareBasedPaymentArrangementExpensedAndCapitalizedIncludedInCostOfRevenueAmountTableTextBlock" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="velo_EarnoutShareUnitsMember" name="EarnoutShareUnitsMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="velo_ChangeInDebtExtinguishedInComparisonToFairValueOfCommonStockIssued" name="ChangeInDebtExtinguishedInComparisonToFairValueOfCommonStockIssued" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="velo_ResearchAndDevelopmentLaboratoryEquipmentMember" name="ResearchAndDevelopmentLaboratoryEquipmentMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="velo_IssuanceOfCommonStockInConnectionWithDebtExtinguishment" name="IssuanceOfCommonStockInConnectionWithDebtExtinguishment" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="velo_OwnershipChangeMember" name="OwnershipChangeMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="velo_ContingentConsiderationLiabilityEarnoutPeriodStockPriceTrigger" name="ContingentConsiderationLiabilityEarnoutPeriodStockPriceTrigger" type="dtr-types:perShareItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false"/>
  <xsd:element id="velo_A2023PrivateWarrantBMember" name="A2023PrivateWarrantBMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="velo_Customer7Member" name="Customer7Member" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="velo_July2024PrivateWarrantsMember" name="July2024PrivateWarrantsMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="velo_DilutiveSecuritiesEffectOfCommonStockWarrants" name="DilutiveSecuritiesEffectOfCommonStockWarrants" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="velo_LeaseLiabilityCurrent" name="LeaseLiabilityCurrent" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="velo_BusinessCombinationContingentConsiderationArrangementsGainLossOnFairValueLiability" name="BusinessCombinationContingentConsiderationArrangementsGainLossOnFairValueLiability" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="velo_RepaymentOfSecuredNotes" name="RepaymentOfSecuredNotes" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="velo_PrivateWarrantsMember" name="PrivateWarrantsMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="velo_IssuanceOfCommonStockWarrantInConnectionWithFinancing" name="IssuanceOfCommonStockWarrantInConnectionWithFinancing" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="velo_AnnualInternalRevenueCodePreOwnershipChangeUtilizedEachYearValue" name="AnnualInternalRevenueCodePreOwnershipChangeUtilizedEachYearValue" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="velo_UnpaidInventoryPurchase" name="UnpaidInventoryPurchase" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="velo_ContingentConsiderationLiabilityEarnoutPeriod" name="ContingentConsiderationLiabilityEarnoutPeriod" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="velo_DilutiveSecuritiesEffectOfRestrictedStockUnits" name="DilutiveSecuritiesEffectOfRestrictedStockUnits" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="velo_LiabilityOfWarrantsOnCommonStockCarriedAtFairValueTextBlock" name="LiabilityOfWarrantsOnCommonStockCarriedAtFairValueTextBlock" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="velo_FebruaryNoteSecondTrancheMember" name="FebruaryNoteSecondTrancheMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="velo_NewLeases" name="NewLeases" type="xbrli:integerItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="velo_BusinessCombinationContingentConsiderationLiabilityMeasurementInputTerm" name="BusinessCombinationContingentConsiderationLiabilityMeasurementInputTerm" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false"/>
  <xsd:element id="velo_EquipmentSubjectToOperatingLeaseMember" name="EquipmentSubjectToOperatingLeaseMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="velo_LesseeLeaseLiabilityToBePaidYearTwo" name="LesseeLeaseLiabilityToBePaidYearTwo" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="velo_A2014StockOptionPlanMember" name="A2014StockOptionPlanMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="velo_DeferredTaxLiabilitiesFixedAssetsAndIntangibles" name="DeferredTaxLiabilitiesFixedAssetsAndIntangibles" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="velo_PlacementAgencyAgreementCashFeeOfAggregatePurchasePrice" name="PlacementAgencyAgreementCashFeeOfAggregatePurchasePrice" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false"/>
  <xsd:element id="velo_GainLossOnFairValueOfWarrants" name="GainLossOnFairValueOfWarrants" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="velo_NonCashWarrantIssuanceInConnectionWithAugustWarrantInducement" name="NonCashWarrantIssuanceInConnectionWithAugustWarrantInducement" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="velo_PlacementAgencyAgreementCertainExpensesReimburseUpTo" name="PlacementAgencyAgreementCertainExpensesReimburseUpTo" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="velo_ReserveForExcessAndObsoleteInventory" name="ReserveForExcessAndObsoleteInventory" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="velo_LongTermDebtCurrentMaturitiesExcludingConvertibleNotes" name="LongTermDebtCurrentMaturitiesExcludingConvertibleNotes" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="velo_A2023PrivatePlacementWarrantsAMember" name="A2023PrivatePlacementWarrantsAMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="velo_SalesWithVariableConsiderations" name="SalesWithVariableConsiderations" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="velo_ContingentConsiderationLiabilityEarnoutPeriodNumberOfTranches" name="ContingentConsiderationLiabilityEarnoutPeriodNumberOfTranches" type="xbrli:integerItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="velo_EarningsPerShareBasicAndDilutedEPSAbstract" name="EarningsPerShareBasicAndDilutedEPSAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="velo_SeniorSecuredConvertiblePromissoryNoteMember" name="SeniorSecuredConvertiblePromissoryNoteMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="velo_ChangeDueToExchangeOfWarrants" name="ChangeDueToExchangeOfWarrants" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="velo_A2024PrivatePlacementWarrantsMember" name="A2024PrivatePlacementWarrantsMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="velo_A2021EmployeeStockPurchasePlanMember" name="A2021EmployeeStockPurchasePlanMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="velo_AverageMarketCapitalizationAmount" name="AverageMarketCapitalizationAmount" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="velo_RepaymentOfLongTermDebtExcludingConvertibleDebt" name="RepaymentOfLongTermDebtExcludingConvertibleDebt" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="velo_WarrantsAndRightsOutstandingIssueDate" name="WarrantsAndRightsOutstandingIssueDate" type="xbrli:dateItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="velo_AugustInducementWarrantsMember" name="AugustInducementWarrantsMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="velo_BepoAgentWarrantsMember" name="BepoAgentWarrantsMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="velo_PaymentsForIssuanceCostRelatedToTheBEPOOffering" name="PaymentsForIssuanceCostRelatedToTheBEPOOffering" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="velo_ExchangeRatio" name="ExchangeRatio" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="velo_JAWSSpitfireAcquisitionCorporationMember" name="JAWSSpitfireAcquisitionCorporationMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="velo_EquipmentSubjectToOperatingLeasePolicyTextBlock" name="EquipmentSubjectToOperatingLeasePolicyTextBlock" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="velo_PercentageOfCommonStockOutstanding" name="PercentageOfCommonStockOutstanding" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false"/>
  <xsd:element id="velo_LesseeLeaseLiabilityToBePaid" name="LesseeLeaseLiabilityToBePaid" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="velo_AtTheMarketOfferingValueOfSharesSold" name="AtTheMarketOfferingValueOfSharesSold" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="velo_RevenueTimeAcceptanceTestPeriod" name="RevenueTimeAcceptanceTestPeriod" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="velo_DebtInstrumentInterestToBeAccrued" name="DebtInstrumentInterestToBeAccrued" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="velo_DebtDerivatives" name="DebtDerivatives" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="velo_MasterServiceAgreementMember" name="MasterServiceAgreementMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="velo_ContingentEarnoutLiabilityScenarioAxis" name="ContingentEarnoutLiabilityScenarioAxis" type="xbrli:stringItemType" substitutionGroup="xbrldt:dimensionItem" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="velo_ContingentEarnoutLiabilityScenarioDomain" name="ContingentEarnoutLiabilityScenarioDomain" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="velo_FinanceLeaseLiabilityToBePaidAfterYearFour" name="FinanceLeaseLiabilityToBePaidAfterYearFour" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="velo_LesseeLeaseLiabilityToBePaidYearOne" name="LesseeLeaseLiabilityToBePaidYearOne" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="velo_OfferingPricePerShare" name="OfferingPricePerShare" type="dtr-types:perShareItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="velo_SecuredNotesFairMarketValue" name="SecuredNotesFairMarketValue" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="velo_IncomeTaxProvisionPreviouslyIssuedTableTextBlock" name="IncomeTaxProvisionPreviouslyIssuedTableTextBlock" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="velo_AccruedExpensesAndOtherLiabilitiesCurrent" name="AccruedExpensesAndOtherLiabilitiesCurrent" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="velo_SecuredNotesAggregatePrincipalAmount" name="SecuredNotesAggregatePrincipalAmount" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="velo_EquipmentOnLease" name="EquipmentOnLease" type="xbrli:integerItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="velo_LegacyVelo3DMember" name="LegacyVelo3DMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="velo_RecurringPaymentMember" name="RecurringPaymentMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="velo_SaleOfStockAdditionalNumberOfSharesIssued" name="SaleOfStockAdditionalNumberOfSharesIssued" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="velo_ThirdNewSecuredNoteMember" name="ThirdNewSecuredNoteMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="velo_AtTheMarketOfferingMember" name="AtTheMarketOfferingMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="velo_NonCurrentPrepaidExpensesAndOtherAssets" name="NonCurrentPrepaidExpensesAndOtherAssets" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="velo_RemainingContractualMaturitiesOfAFSInvestmentsTableTextBlock" name="RemainingContractualMaturitiesOfAFSInvestmentsTableTextBlock" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="velo_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationsTechniqueTableTextBlock" name="FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationsTechniqueTableTextBlock" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="velo_A3DPrintersMember" name="A3DPrintersMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="velo_GainLossOnFairValueOfContingentEarnoutLiability" name="GainLossOnFairValueOfContingentEarnoutLiability" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="velo_A2023PrivatePlacementWarrantsBMember" name="A2023PrivatePlacementWarrantsBMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="velo_EffectiveIncomeTaxRateReconciliationSectionThreeEightyTwoLimitationPercent" name="EffectiveIncomeTaxRateReconciliationSectionThreeEightyTwoLimitationPercent" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="velo_ProceedsFromIssuanceOfLongTermDebtExcludingConvertibleDebt" name="ProceedsFromIssuanceOfLongTermDebtExcludingConvertibleDebt" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="velo_DilutiveSecuritiesEffectOfCommonStockUnits" name="DilutiveSecuritiesEffectOfCommonStockUnits" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="velo_PaymentOfLongTermDebtExcludingConvertibleDebt" name="PaymentOfLongTermDebtExcludingConvertibleDebt" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="velo_CustomerDepositNoncashConsideration" name="CustomerDepositNoncashConsideration" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="velo_EffectiveIncomeTaxRateReconciliationFairValueAdjustmentsPercent" name="EffectiveIncomeTaxRateReconciliationFairValueAdjustmentsPercent" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="velo_EffectiveIncomeTaxRateReconciliationResearchAndDevelopmentCreditsPercent" name="EffectiveIncomeTaxRateReconciliationResearchAndDevelopmentCreditsPercent" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="velo_AccruedExpensesAndOtherCurrentLiabilitiesMember" name="AccruedExpensesAndOtherCurrentLiabilitiesMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="velo_FebruaryNoteMember" name="FebruaryNoteMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="velo_BepoWarrantsAndBepoAgentWarrantLiabilitiesMember" name="BepoWarrantsAndBepoAgentWarrantLiabilitiesMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="velo_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExpectedToVestWeightedAverageGrantDateFairValue" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExpectedToVestWeightedAverageGrantDateFairValue" type="dtr-types:perShareItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false"/>
  <xsd:element id="velo_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExpectedToVest" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExpectedToVest" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false"/>
  <xsd:element id="velo_AugustTwoThousandTwentyFourRegisteredWarrantsMember" name="AugustTwoThousandTwentyFourRegisteredWarrantsMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="velo_LesseeLeaseLiabilityUndiscountedExcessAmount" name="LesseeLeaseLiabilityUndiscountedExcessAmount" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="velo_StockIssuedDuringPeriodSharesIssuanceOfCommonStockInConnectionWithWarrantCancellation" name="StockIssuedDuringPeriodSharesIssuanceOfCommonStockInConnectionWithWarrantCancellation" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="velo_NonRule10B51ArrModifiedFlag" name="NonRule10B51ArrModifiedFlag" type="xbrli:booleanItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="velo_ScheduleOfAccruedAndOtherCurrentLiabilitiesTableTextBlock" name="ScheduleOfAccruedAndOtherCurrentLiabilitiesTableTextBlock" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="velo_DebtInstrumentRedemptionPaymentStartDate" name="DebtInstrumentRedemptionPaymentStartDate" type="xbrli:dateItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="velo_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityChangeDueToExchange" name="FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityChangeDueToExchange" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="velo_ClassOfWarrantOrRightFairValueOfWarrantsOrRightsAtIssuance" name="ClassOfWarrantOrRightFairValueOfWarrantsOrRightsAtIssuance" type="srt-types:perUnitItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false"/>
  <xsd:element id="velo_DisclosureMomentusMasterServiceAgreementAbstract" name="DisclosureMomentusMasterServiceAgreementAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="velo_LesseeLeaseLiabilityToBePaidYearFour" name="LesseeLeaseLiabilityToBePaidYearFour" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="velo_LeaseLiability" name="LeaseLiability" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="velo_ThienemanConstructionIncMember" name="ThienemanConstructionIncMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="velo_ReverseStockSplitRatio" name="ReverseStockSplitRatio" type="xbrli:pureItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="velo_InterestPayments" name="InterestPayments" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="velo_CostOf3DPrinterAndPartsMember" name="CostOf3DPrinterAndPartsMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="velo_A2024PrivateWarrantsMember" name="A2024PrivateWarrantsMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="velo_ComputersAndSoftwareMember" name="ComputersAndSoftwareMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="velo_SalesTypeLeaseHavingEffectiveInterestRate" name="SalesTypeLeaseHavingEffectiveInterestRate" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false"/>
  <xsd:element id="velo_SeriesAConvertiblePreferredStockMember" name="SeriesAConvertiblePreferredStockMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="velo_LongTermDebtExcludingConvertibleNotesAndCurrentMaturities" name="LongTermDebtExcludingConvertibleNotesAndCurrentMaturities" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="velo_ContingentEarnoutLiabilityPolicyPolicyTextBlock" name="ContingentEarnoutLiabilityPolicyPolicyTextBlock" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="velo_StockBasedCompensationExpenseIncludedInCostOfRevenue" name="StockBasedCompensationExpenseIncludedInCostOfRevenue" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="velo_WarrantExpirationPeriod" name="WarrantExpirationPeriod" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false"/>
  <xsd:element id="velo_CommonStockConvertibleConversionPrice" name="CommonStockConvertibleConversionPrice" type="dtr-types:perShareItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false"/>
  <xsd:element id="velo_NumberOfConsecutiveTradingDays" name="NumberOfConsecutiveTradingDays" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="velo_NonCashTransferOfPropertyAndEquipmentNetToInventoriesNet" name="NonCashTransferOfPropertyAndEquipmentNetToInventoriesNet" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="velo_EffectiveIncomeTaxRateReconciliationResearchAndDevelopmentAmount" name="EffectiveIncomeTaxRateReconciliationResearchAndDevelopmentAmount" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="velo_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueGranted" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueGranted" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="velo_UnderwritingDiscountsAndCommissionsAndOtherEstimatedOfferingExpensesPayable" name="UnderwritingDiscountsAndCommissionsAndOtherEstimatedOfferingExpensesPayable" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="velo_OperatingExpensesPolicyPolicyTextBlock" name="OperatingExpensesPolicyPolicyTextBlock" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="velo_SharesIssuedSharesShareBasedPaymentArrangementCapitalRaiseNetOfIssuanceCosts" name="SharesIssuedSharesShareBasedPaymentArrangementCapitalRaiseNetOfIssuanceCosts" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="velo_ContingentConsiderationLiabilityEarnoutPeriodThresholdConsecutiveTradingDays" name="ContingentConsiderationLiabilityEarnoutPeriodThresholdConsecutiveTradingDays" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="velo_FinanceLeaseInterestExpenseAndAmortization" name="FinanceLeaseInterestExpenseAndAmortization" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="velo_Customer8Member" name="Customer8Member" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="velo_FebruaryNoteFirstTrancheMember" name="FebruaryNoteFirstTrancheMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="velo_AssetsAndLiabilitiesLesseeTableTextBlock" name="AssetsAndLiabilitiesLesseeTableTextBlock" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="velo_PercentageOfOriginalCostOfEquipment" name="PercentageOfOriginalCostOfEquipment" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false"/>
  <xsd:element id="velo_TwoThousandTwentyFiveEquipmentLoanMember" name="TwoThousandTwentyFiveEquipmentLoanMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="velo_EquipmentOnLeasePayments" name="EquipmentOnLeasePayments" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="velo_CustomerLiabilitiesNoncashCompensationCurrent" name="CustomerLiabilitiesNoncashCompensationCurrent" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="velo_ContingentEarnoutLiabilityMember" name="ContingentEarnoutLiabilityMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="velo_UnderwritingAgreementMember" name="UnderwritingAgreementMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="velo_MeasurementInputExpectedVolatilityMember" name="MeasurementInputExpectedVolatilityMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="velo_TransferOfPropertyAndEquipmentNetToInventoriesNet" name="TransferOfPropertyAndEquipmentNetToInventoriesNet" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="velo_A2024PrivateWarrantBMember" name="A2024PrivateWarrantBMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="velo_AtTheMarketOfferingTextBlock" name="AtTheMarketOfferingTextBlock" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="velo_AtTheMarketOfferingCompanyMayOfferToSellJanuary312024Amendment" name="AtTheMarketOfferingCompanyMayOfferToSellJanuary312024Amendment" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="velo_RevisionOfPreviouslyIssuedCondensedConsolidatedFinancialStatementsTableTextBlock" name="RevisionOfPreviouslyIssuedCondensedConsolidatedFinancialStatementsTableTextBlock" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="velo_EquipmentLoanFeesToBeAmortized" name="EquipmentLoanFeesToBeAmortized" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="velo_Customer2Member" name="Customer2Member" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="velo_BusinessCombinationContingentConsiderationArrangementsLiabilityRollForward" name="BusinessCombinationContingentConsiderationArrangementsLiabilityRollForward" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="velo_LesseeFinancingLeaseLiabilityUndiscountedExcessAmount" name="LesseeFinancingLeaseLiabilityUndiscountedExcessAmount" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="velo_DebtForEquityExchangeMember" name="DebtForEquityExchangeMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="velo_A2024PrivateWarrantsLiabilityMember" name="A2024PrivateWarrantsLiabilityMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="velo_AprilTwoThousandAndTwentyFourSecuritiesPurchaseAgreementMember" name="AprilTwoThousandAndTwentyFourSecuritiesPurchaseAgreementMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="velo_PublicWarrantsMember" name="PublicWarrantsMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="velo_ProductWarrantiesPolicyTextBlock" name="ProductWarrantiesPolicyTextBlock" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="velo_SecuredNotesAggregatePrincipalAmountRepaid" name="SecuredNotesAggregatePrincipalAmountRepaid" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="velo_AprilAndJulyTwoThousandTwentyFourUnregisteredWarrantsMember" name="AprilAndJulyTwoThousandTwentyFourUnregisteredWarrantsMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="velo_PlacementAgentWarrantsExercisePrice" name="PlacementAgentWarrantsExercisePrice" type="dtr-types:perShareItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false"/>
  <xsd:element id="velo_WarrantsPolicyPolicyTextBlock" name="WarrantsPolicyPolicyTextBlock" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="velo_CancellationOfPrincipalAmount" name="CancellationOfPrincipalAmount" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="velo_PlacementAgencyAgreementCertainExpensesReimbursedAmount" name="PlacementAgencyAgreementCertainExpensesReimbursedAmount" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="velo_Customer1Member" name="Customer1Member" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="velo_LongTermDebtExcludingConvertibleNotes" name="LongTermDebtExcludingConvertibleNotes" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="velo_ATMSalesAgreementMember" name="ATMSalesAgreementMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="velo_RDOWarrantsMember" name="RDOWarrantsMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="velo_AugustTwoThousandTwentyFiveOfferingMember" name="AugustTwoThousandTwentyFiveOfferingMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="velo_SharesIssuedSharesShareBasedPaymentArrangementDebtExinguishment" name="SharesIssuedSharesShareBasedPaymentArrangementDebtExinguishment" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="velo_ContingentConsiderationLiabilityEarnoutPeriodThresholdTradingDays" name="ContingentConsiderationLiabilityEarnoutPeriodThresholdTradingDays" type="xbrli:integerItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="velo_A2023PrivateWarrantAMember" name="A2023PrivateWarrantAMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="velo_ChangeInFairValueOfContingentEarnoutLiabilities" name="ChangeInFairValueOfContingentEarnoutLiabilities" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="velo_LesseeLeaseOperatingLiabilityUndiscountedExcessAmount" name="LesseeLeaseOperatingLiabilityUndiscountedExcessAmount" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="velo_ServiceAgreementTerm" name="ServiceAgreementTerm" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="velo_CustomerLiabilitiesPrepaidReserveCurrent" name="CustomerLiabilitiesPrepaidReserveCurrent" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="velo_EquipmentOnLeaseAggregateCarryingValueReclassifiedToFinishedGoodsInventory" name="EquipmentOnLeaseAggregateCarryingValueReclassifiedToFinishedGoodsInventory" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="velo_SecuritiesPurchaseAgreementRepaymentPrice" name="SecuritiesPurchaseAgreementRepaymentPrice" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="velo_DebtInstrumentCovenantMinimumLiquidityRequirement" name="DebtInstrumentCovenantMinimumLiquidityRequirement" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="velo_IssuanceOfCommonStockInConnectionWithWarrantCancellation" name="IssuanceOfCommonStockInConnectionWithWarrantCancellation" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="velo_RealizedLossOnAvailableForSaleSecurities" name="RealizedLossOnAvailableForSaleSecurities" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="velo_FebruaryTwoThousandAndTwentyFiveSecuritiesPurchaseAgreementMember" name="FebruaryTwoThousandAndTwentyFiveSecuritiesPurchaseAgreementMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="velo_DebtInstrumentAccruedInterest" name="DebtInstrumentAccruedInterest" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="velo_UnpaidLiabilitiesRelatedToPropertyAndEquipment" name="UnpaidLiabilitiesRelatedToPropertyAndEquipment" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="velo_ValueOfSharesSoldMayOfferAndSellUpTo" name="ValueOfSharesSoldMayOfferAndSellUpTo" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="velo_Customer5Member" name="Customer5Member" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="velo_EligibleVelo3DEquityholdersMember" name="EligibleVelo3DEquityholdersMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="velo_DecemberTwoThousandTwentyFivePIPEFinancingMember" name="DecemberTwoThousandTwentyFivePIPEFinancingMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="velo_FairValueOfCommonStockIssuedInExchangeTransaction" name="FairValueOfCommonStockIssuedInExchangeTransaction" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="velo_GainLossOnDebtExtinguishmentIncludingNetOfGainOnExchangeOfDebtForCommonStock" name="GainLossOnDebtExtinguishmentIncludingNetOfGainOnExchangeOfDebtForCommonStock" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="velo_FairValueOfCustomerLiabilityMeasurementInputTerm" name="FairValueOfCustomerLiabilityMeasurementInputTerm" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="velo_GoingConcernPolicyTextBlock" name="GoingConcernPolicyTextBlock" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="velo_FutureLeasePaymentsExpected" name="FutureLeasePaymentsExpected" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="velo_MomentusMasterServiceAgreementDisclosureTextBlock" name="MomentusMasterServiceAgreementDisclosureTextBlock" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="velo_LongTermDebtCurrentMaturities" name="LongTermDebtCurrentMaturities" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="velo_MinimumClosingBidPriceOfConsecutiveTradingDays" name="MinimumClosingBidPriceOfConsecutiveTradingDays" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="velo_Customer6Member" name="Customer6Member" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="velo_SecuritiesPurchaseAgreementMember" name="SecuritiesPurchaseAgreementMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="velo_WarrantToPurchaseCommonStockMember" name="WarrantToPurchaseCommonStockMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="velo_DebtDerivativeMember" name="DebtDerivativeMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="velo_SecuredNotesMember" name="SecuredNotesMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="velo_LossOnDebtExtinguishmentUnamortizedDeferredFinancingCosts" name="LossOnDebtExtinguishmentUnamortizedDeferredFinancingCosts" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="velo_SecuredNoteDueTwoThousandTwentySixMember" name="SecuredNoteDueTwoThousandTwentySixMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="velo_EquipmentForLeaseToCustomersReturnedToInventory" name="EquipmentForLeaseToCustomersReturnedToInventory" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="velo_NonCashCostOfIssuanceOfCommonStockWarrantsOnBepoOffering" name="NonCashCostOfIssuanceOfCommonStockWarrantsOnBepoOffering" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="velo_JanuaryNoteMember" name="JanuaryNoteMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="velo_ScheduleOfDeferredTaxAssetsPreviouslyIssuedTableTextBlock" name="ScheduleOfDeferredTaxAssetsPreviouslyIssuedTableTextBlock" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="velo_LesseeLeaseLiabilityToBePaidAfterYearFour" name="LesseeLeaseLiabilityToBePaidAfterYearFour" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="velo_LesseeOperatingLeaseAreaOfProperty" name="LesseeOperatingLeaseAreaOfProperty" type="dtr-types:areaItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false"/>
  <xsd:element id="velo_Customer9Member" name="Customer9Member" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="velo_EquipmentSubjectToOperatingLeaseNetReturnedToInventoriesNet" name="EquipmentSubjectToOperatingLeaseNetReturnedToInventoriesNet" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="velo_Customer10Member" name="Customer10Member" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="velo_MomentusIncMember" name="MomentusIncMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="velo_WarrantRedemptionScenarioOneMember" name="WarrantRedemptionScenarioOneMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="velo_WarrantInducementAgreementMember" name="WarrantInducementAgreementMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="velo_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearThree" name="LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearThree" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="velo_AprilTwoThousandTwentyFourRegisteredWarrantsMember" name="AprilTwoThousandTwentyFourRegisteredWarrantsMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="velo_FairValueOfWarrantsOnLossOfDebtExtinguishment" name="FairValueOfWarrantsOnLossOfDebtExtinguishment" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="velo_EffectiveIncomeTaxRateReconciliationSectionThreeEightyTwoLimitationAmount" name="EffectiveIncomeTaxRateReconciliationSectionThreeEightyTwoLimitationAmount" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="velo_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueForfeited" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueForfeited" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="velo_NewWarrantsMember" name="NewWarrantsMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="velo_AtTheMarketOfferingNetIssuanceCost" name="AtTheMarketOfferingNetIssuanceCost" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="velo_PaymentsForIssuanceCostRelatedToAugustTwoThousandTwentyFiveOffering" name="PaymentsForIssuanceCostRelatedToAugustTwoThousandTwentyFiveOffering" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="velo_SalesTypeLeasingMonthlyPaymentsAndIncludedPurchaseOptionAtEndOfCompletionOfTheInitialTerm" name="SalesTypeLeasingMonthlyPaymentsAndIncludedPurchaseOptionAtEndOfCompletionOfTheInitialTerm" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="velo_EquipmentAvailableForLeaseMember" name="EquipmentAvailableForLeaseMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="velo_SecuritiesPurchaseAgreementAggregatePrincipalAmountOfNotesPartialRedemption" name="SecuritiesPurchaseAgreementAggregatePrincipalAmountOfNotesPartialRedemption" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="velo_PercentageOfOriginalCostOfEquipmentElapsed" name="PercentageOfOriginalCostOfEquipmentElapsed" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false"/>
  <xsd:element id="velo_PlacementAgencyAgreementMember" name="PlacementAgencyAgreementMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="velo_IssuanceOfCommonStockInConnectionWithCapitalRaiseNetOfIssuanceCosts" name="IssuanceOfCommonStockInConnectionWithCapitalRaiseNetOfIssuanceCosts" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="velo_AtTheMarketOfferingTable" name="AtTheMarketOfferingTable" type="xbrli:stringItemType" substitutionGroup="xbrldt:hypercubeItem" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="velo_SecuredNotesAccretingDiscounts" name="SecuredNotesAccretingDiscounts" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="velo_ContingentEarnoutLiabilityScenarioTwoMember" name="ContingentEarnoutLiabilityScenarioTwoMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="velo_CostOf3DPrinterMember" name="CostOf3DPrinterMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="velo_ThirdOldSecuredNoteMember" name="ThirdOldSecuredNoteMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="velo_WarrantLiabilityRollForward" name="WarrantLiabilityRollForward" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="velo_PlacementAgentWarrantsPercentOfferingPrice" name="PlacementAgentWarrantsPercentOfferingPrice" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false"/>
  <xsd:element id="velo_FairValueAssumptionUsedInValuationTechniquesOfLiabilityTableTextBlock" name="FairValueAssumptionUsedInValuationTechniquesOfLiabilityTableTextBlock" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="velo_PrivatePlacementWarrantsMember" name="PrivatePlacementWarrantsMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="velo_GrossProceedsFormIssuanceOfCommonStock" name="GrossProceedsFormIssuanceOfCommonStock" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="velo_SecuredNotesAccretingDiscountsAmortizedToInterestExpenses" name="SecuredNotesAccretingDiscountsAmortizedToInterestExpenses" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="velo_SecondSecuredNotesMember" name="SecondSecuredNotesMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="velo_AtTheMarketOfferingFixedCommissionRate" name="AtTheMarketOfferingFixedCommissionRate" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="velo_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueExpectedToVest" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueExpectedToVest" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="velo_NoticeOfDelistingPolicyTextBlock" name="NoticeOfDelistingPolicyTextBlock" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="velo_CumulativeOverStatementOfStockBasedCompensationExpense" name="CumulativeOverStatementOfStockBasedCompensationExpense" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="velo_LeaseLiabilityNoncurrent" name="LeaseLiabilityNoncurrent" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="velo_ProceedsFromCapitalRaiseFromAugustWarrantInducement" name="ProceedsFromCapitalRaiseFromAugustWarrantInducement" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="velo_DecemberTwoThousandTwentyThreeRegisteredWarrantsMember" name="DecemberTwoThousandTwentyThreeRegisteredWarrantsMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="velo_A2024PrivateWarrantAMember" name="A2024PrivateWarrantAMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="velo_CostOfSupportServicesMember" name="CostOfSupportServicesMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="velo_HighTrailHoldersMember" name="HighTrailHoldersMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="velo_TotalLeaseLiabilities" name="TotalLeaseLiabilities" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="velo_EquipmentOnLeaseMember" name="EquipmentOnLeaseMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="velo_LeasePayments" name="LeasePayments" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="velo_GainOnExchangeOfDebtForCommonStock" name="GainOnExchangeOfDebtForCommonStock" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="velo_A2021StockOptionPlanMember" name="A2021StockOptionPlanMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="velo_PercentageOfRevenueWithRecurringPaymentTransactions" name="PercentageOfRevenueWithRecurringPaymentTransactions" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="velo_ServiceFees" name="ServiceFees" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="velo_AtTheMarketOfferingLineItems" name="AtTheMarketOfferingLineItems" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="velo_OtherMember" name="OtherMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="velo_AdvancesOnPurchases" name="AdvancesOnPurchases" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="velo_FairValueOfCustomerLiabilityMeasurementInput" name="FairValueOfCustomerLiabilityMeasurementInput" type="xbrli:decimalItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false"/>
  <xsd:element id="velo_LesseeLeaseLiabilityToBePaidYearThree" name="LesseeLeaseLiabilityToBePaidYearThree" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="velo_A2021EquityIncentivePlanMember" name="A2021EquityIncentivePlanMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="velo_PlacementAgencyAgreementSharesPurchaseNumberOfSharesOfCommonStockSoldInOffering" name="PlacementAgencyAgreementSharesPurchaseNumberOfSharesOfCommonStockSoldInOffering" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false"/>
  <xsd:element id="velo_ScheduleOfWarrantsAndRightsRollForwardTableTextBlock" name="ScheduleOfWarrantsAndRightsRollForwardTableTextBlock" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
</xsd:schema>
