Agree on the question the prototype answers
Write down the main reason for making this version. You might be checking whether a housing fits the available space, whether a handle is comfortable, or whether a fixture leaves enough access for assembly. A focused objective gives the design review a clear purpose and makes feedback easier to act on.
Check the model against your brief
Review overall dimensions, mounting points, openings, and clearances. Confirm which dimensions were supplied and which remain assumptions. Use the 3D preview to inspect the visible geometry, but do not treat a good-looking model as proof of physical fit, strength, or performance. Resolve important unanswered questions before approving.
Approve a specific revision and scope
Confirm the revision label, quantity, material proposal, price, and handoff details. If you request a change, wait for the revised proposal and review that version. Referencing the same revision in the model, quote, and approval helps avoid uncertainty about which design should be printed.
Record the physical trial
When the part is available, compare it with the original objective. Photograph interference points and mark the features that need attention. Replace vague feedback such as “make it fit better” with a specific observation, measurement, or annotated image. Keep the trial conditions in your notes so future comparisons are meaningful.
Decide what happens next
A successful trial may support a repeat order. A useful failure may point to a small revision or a different approach. Keep the results alongside the design revision, and discuss any changed requirements before another print. The purpose of prototyping is to learn enough to make the next decision with better information.