Choose what the build must prove
A visual model, fit check, functional prototype, engineering validation build and production pilot are different deliverables. State the learning goal before selecting material and process.
Understand process fidelity
Fast prototype methods may use different materials, tolerances or surface behaviour from production. That can be appropriate if the difference is documented and does not undermine the question being tested.
Introduce controls in stages
As a design stabilises, tighten revision control, supplier traceability, inspection plans, acceptance criteria and change approval. Production readiness is a controlled transition, not simply a larger order.
- Design freeze criteria
- Tooling and fixture readiness
- Process validation
- Pilot acceptance and ramp plan
Plan the handover
Ensure the product definition, test assets, approved sources, process knowledge and lessons from prototypes are available to the production team. Hidden prototype knowledge becomes production risk.