Inspect before you assemble
Dimensions
Verify critical dimensions and tolerances against the drawing. Focus on mating features, bores and threaded holes — that is where a small error becomes an assembly failure.
Surface finish
Look for layer lines, porosity, sinks or finish defects that affect fit or appearance. A part can be dimensionally right and still unusable.
Structure & function
Confirm wall thickness and internal channels, then test function — does it move, seal or carry load as intended? Printed and cast parts vary in ways drawings don't show.
Documentation
Match the material cert, process record and inspection report to the order. Keep them for traceability, especially for medical or automotive work.
Don't accept a photo as proof
Minimum contents
A usable inspection report lists the measured critical dimensions (not just "passed"), the process and material used, and the inspection date. Photos of finished parts are helpful but not a substitute for numbers.
Ask for it up front
Request measurement reports and material certificates when you brief the supplier, not after delivery. It changes how the order is handled.
Why it protects you
Documentation lets you trace a failure back to a process or batch, and it is often required for regulatory or customer audits. See how we handle quality and standards.
Common red flags
Vague "all good" sign-offs, missing material certs, or tolerance claims with no measurement behind them. Push for specifics.
Build quality in from the start
Pick the right process
Tolerance and structure start with process choice. See 3D printing vs CNC and vacuum casting vs CNC.
Verify the maker
A shop that reviews your file before quoting catches issues early. Our supplier checklist explains what to check.
Know the costs
Inspection is part of the quote, not an extra. See our pricing reference.
Common questions
Start with critical dimensions and mating features — bores, threads and interfaces. A part can look fine and still not assemble. Then check surface, structure and documentation.
No. A photo shows appearance, not measured dimensions or material. Ask for a report with measured critical values and a material cert for traceability.
Yes. State it in the brief so the supplier plans inspection in, rather than treating it as an afterthought. See our FAQ on confidentiality and process.