Additive Manufacturing Non-Conformance: From Detection to Disposition
What Should Happen When an Additive Manufacturing Part Does Not Conform?
A dimensional inspection comes back outside tolerance. A material record does not match the production documentation. A process step was completed under conditions that now need review.
Finding the problem is only the beginning.
The next challenge is deciding what happens to the affected part or build without allowing uncertain output to keep moving through production. Who needs to review it? How far does the issue extend? Can the part be reworked? Does it need to be scrapped? What information needs to follow that decision?
For additive manufacturing operations, a non-conformance is therefore more than a quality record. It is a workflow event.
Managing it well means keeping the requirement, affected output, evidence, decisions and subsequent production actions connected from detection through to closure.
In formal quality-management terminology, ISO uses the term ‘nonconformity’. ‘Non-conformance’ is also commonly used in industry, and we use it here for readability.
A non-conformance is a workflow event, not just a quality record
In formal quality terminology, a nonconformity is the non-fulfilment of a requirement.
What matters operationally is what happens next.
A quality team may identify the issue, but production may need to stop or hold work. Engineering may need to review technical evidence. Inspection may need to gather more information. A downstream operation may need to wait for a decision.
Simply recording that an NCR has been raised does not control any of those consequences.
The non-conformance may be discovered in one place, but the decision can affect the wider production workflow.
That is why the process needs to establish three things quickly:
What requirement is in question?
What output may be affected?
What controlled decision is needed before work progresses?
The exact procedure will depend on the organisation's quality management system, customer requirements and any applicable industry or regulatory requirements. There is no single disposition process that applies to every AM part.
The workflow principles below can provide a practical starting point, but they do not replace an organisation's own QMS or applicable requirements.
Step 1: Identify the requirement that has not been met
Before deciding what should happen to a part, establish what it is actually being assessed against.
That requirement could come from:
a drawing or model;
a customer specification;
an approved manufacturing instruction;
a material specification;
an inspection or test requirement;
an approved process condition;
a contractual requirement;
an applicable regulatory requirement.
This distinction matters.
“There is something wrong with this part” is not enough information to support a disposition.
The useful question is:
Which requirement has not been met, and what evidence tells us that?
For purchased AM parts, ISO/ASTM 52901 provides useful context. It covers requirements exchanged between customer and part provider, including part-definition data, feedstock requirements, final-part characteristics, inspection requirements and part-acceptance methods.
The relevant requirement therefore needs to remain connected to the production record and the evidence showing why the output is being questioned.
This is also where wider traceability becomes important. If identifying the material, design revision, inspection requirement or process history already involves searching through several disconnected systems, handling the non-conformance becomes harder before the review has even started.
For a broader look at that problem, see Traceability & Compliance in Additive Manufacturing: The Complete Guide.
Step 2: Identify and control the affected output
Once a potential non-conformance has been identified, affected output needs to be controlled so that it does not continue through production unintentionally.
How that happens will depend on the organisation's procedures and the nature of the issue.
It may involve:
changing the status of the affected job or part;
identifying the quantity potentially affected;
controlling physical parts where appropriate;
preventing downstream production steps;
identifying related material or documentation that needs review;
notifying the appropriate quality, engineering or production personnel.
The important point is not that every organisation follows exactly the same method.
It is that everybody who needs to act on the production status is working from the same information.
If quality has placed a part on hold but the post-processing team cannot see that status, the quality decision has not yet been translated into operational control.
This is where non-conformance management starts to become a workflow problem rather than simply a documentation problem.
Step 3: Determine the scope of the non-conformance
The first part that exposes a problem may not be the only part affected.
Suppose dimensional inspection finds an out-of-tolerance feature on one component from a multi-part build. The immediate question is not necessarily whether that one component should be rejected.
The team may first need to establish whether:
other parts from the same build could be affected;
the problem is confined to one characteristic or region;
the same material or process condition was used elsewhere;
additional inspection is needed;
another job could be affected by the same underlying condition.
The objective is to establish the scope before making the disposition.
That does not mean assuming every connected item is non-conforming. It means having enough traceability to determine what needs review.
This distinction also helps prevent unnecessary containment. Without reliable production history, teams can be forced to widen the investigation simply because they cannot confidently isolate what was affected.
Step 4: Gather the information needed for review
The people responsible for the disposition need enough evidence to make an informed decision.
Exactly what they need will depend on the non-conformance, but relevant information could include:
the applicable drawing or model revision;
specifications and acceptance criteria;
the production job record;
machine information;
material or batch records;
relevant process information;
inspection or test results;
photographs;
operator observations;
post-processing history;
approvals or changes associated with the job.
This is not a universal checklist.
A documentation discrepancy may require a very different set of evidence from a dimensional non-conformance or unexpected material result.
The principle is more useful than the list:
Gather the information needed to understand the requirement, affected output and proposed disposition — and keep it connected to the issue being reviewed.
ISO/ASTM 52920:2023 provides relevant AM-specific context here. The standard defines quality-assurance measures and quality-relevant activities across industrial additive manufacturing processes and production sites.
It does not prescribe the workflow described in this article. But it reinforces an important point: additive manufacturing quality is managed across a production process, not simply at the point where the machine produces a part.
Step 5: Decide the disposition
Once the affected output and supporting information have been reviewed, an authorised disposition can be made according to the organisation's applicable procedures and requirements.
Possible outcomes may include:
Release after review
Where an initially suspected issue is investigated and the output is shown to meet the applicable requirements, it may be released according to the organisation's normal controls.
Rework
ISO 9000:2026 defines rework as action on a nonconforming product or service to make it conform to requirements.
Repair
Where applicable, repair may make the output acceptable for its intended use, but does not necessarily make it conform to the original requirements. ISO notes that a concession may also be required.
Scrap
Action taken to prevent the nonconforming product from being used for its originally intended purpose.
Concession
Permission to use or release output that does not conform to specified requirements, where authorised and applicable.
Hold for further review
Where more evidence or authorised technical review is required before a decision can be made.
Other dispositions may be available where the organisation's quality system, contractual requirements or applicable standards allow them.
The important point is that disposition is not simply a judgement about whether a part “looks usable”.
It must relate back to the requirement that triggered the non-conformance in the first place.
That becomes particularly important in AM because the value already invested in a part can make recovery attractive. Long build times, expensive feedstock and subsequent processing can all create pressure to avoid scrapping an item.
Cost, however, does not determine conformity.
The decision still needs to follow the requirements governing that part.
Step 6: Make sure the right people approve the decision
Identifying a technically sensible disposition is only part of the process.
It also needs the appropriate authority.
Depending on the organisation, part and issue, review might involve quality, engineering, production or another authorised function. Customer approval may also be required in some circumstances.
There is no universal approval chain that applies to every AM non-conformance.
The relevant question is:
Who has the authority to approve this decision under the applicable quality system and customer requirements?
This is where email-based workflows can become fragile.
An engineer may approve rework in one conversation while production continues to see the job as held. Inspection may receive the revised part without visibility of what changed. Someone may later need to reconstruct who authorised the decision and why.
The problem is not necessarily that the approval did not happen.
It is that the approval, evidence and production status can become separated from one another.
That separation is also one of the issues that can undermine audit readiness. We explore the wider record-keeping challenge in 5 Reasons Your Additive Manufacturing Traceability Strategy Will Fail Audit.
Step 7: Carry the disposition into production
A disposition only matters if production follows it.
If rework has been approved, the correct rework activity needs to reach the people responsible for carrying it out.
If further inspection is required, the part should not accidentally progress beyond that decision point.
If the affected part is scrapped, subsequent operations need to stop.
If a replacement build is needed, production planning may need to change.
The quality decision therefore has to become an operational action.
This is also where non-conformance management intersects with wider production recovery. A single rejected part may be straightforward to replace. A build containing several affected parts could disrupt machine scheduling, downstream capacity and delivery commitments.
The quality workflow and the production workflow cannot operate as entirely separate processes if the decision made in one directly changes the other.
Step 8: Close the record without losing the lesson
Closure should mean that the required actions have been completed and recorded.
It should not mean that the history disappears.
A useful non-conformance record should make it possible to understand, as appropriate:
which requirement was not met;
what output was affected;
what evidence was reviewed;
what disposition was authorised;
who approved the decision where required;
what subsequent action was taken;
when the issue was closed.
If investigation or corrective action is required under the organisation's procedures, that activity should remain connected to the original issue.
But not every non-conformance necessarily requires the same level of investigation.
The response should follow the organisation's QMS and applicable requirements, which may call for different levels of review or action depending on the issue.
Good records also make recurring problems easier to recognise.
One isolated non-conformance may tell you very little. Repeated issues associated with the same process step, part characteristic or production condition could be far more useful.
That value disappears if each record exists as an isolated PDF, spreadsheet row or email chain with no useful connection back to production.
What a practical AM non-conformance workflow can look like
The details will vary between manufacturers, but a practical sequence might look like this:
Potential non-conformance identified
↓
Confirm the applicable requirement
↓
Identify and control affected output
↓
Determine the scope
↓
Gather relevant evidence
↓
Review and decide the disposition
↓
Obtain required approval
↓
Carry the decision into production
↓
Verify required action and close the record
This is not a universal ISO/ASTM-prescribed NCR procedure.
It is a practical model for keeping the decisions surrounding a non-conformance connected.
Each manufacturer still needs to follow its own quality management system, applicable standards and customer or regulatory requirements.
Where connected production workflows can help
Non-conformance management becomes harder when the information needed to control the issue lives in separate places.
The production job is in one system. Inspection results are somewhere else. Material history is in a spreadsheet. Approval arrives by email. Production status is updated manually.
People can still manage a non-conformance that way.
But they also spend time assembling the context before they can act on it.
Authentise FlowsAM can help connect production workflows, scheduling, traceability and approvals around the work being produced. That means the production status and relevant actions surrounding an issue can remain linked to the affected job rather than existing as a separate administrative trail.
It does not determine whether a part conforms.
It does not replace engineering judgement, inspection or an organisation's quality management system.
Its role is operational: helping ensure that the information and decisions affecting production remain connected to the work they describe.
That becomes particularly useful when a non-conformance changes what needs to happen next.
A non-conformance should result in a controlled decision
Finding a non-conformance is not the end of the quality process.
It is the point where a controlled decision needs to begin.
Identify the requirement. Control the affected output. Establish the scope. Gather the right evidence. Make an authorised disposition. Carry that decision into production and retain the record that explains what happened.
The objective is not to create more quality paperwork.
It is to make sure uncertain output cannot quietly become accepted production simply because the information needed to stop it was somewhere else.
Next step: If non-conformances still rely on disconnected emails, spreadsheets and manual status updates, explore how Authentise FlowsAM can help keep production workflows, approvals and traceability connected.
