A working prototype is a real milestone, but it answers only one question: can this exist? Manufacturing asks a different one: can a factory make ten thousand of these, at your price, without redesigning it first? This checklist is the gap between those two questions — the items that are usually still open at exactly the moment a founder feels ready.
Why this matters
A prototype is built from whatever parts were available: a hand-soldered board, a motor from an online listing, an enclosure off a 3D printer. None of that survives contact with a production line unchanged — and the changes are where cost, manufacturing risk, and delay live.
Every item still open when you ask for a quote becomes either a redesign after tooling is paid for (expensive) or a silent assumption inside the factory's number (padded). Closing the checklist first is the cheap version of both.
Function is proven. Production is not.
The prototype proves the idea works once, assembled by the person who designed it. Production readiness means a stranger can assemble it repeatedly, at tolerance, at line speed, from parts that exist at your volume. Those are different bars, and the second one is the one a factory prices.
The BOM is not frozen yet
A frozen bill of materials names production-grade parts — and ideally a second source for the ones that matter. If your BOM still says 'the motor we found online' or 'adhesive for now, fasteners later', it is not frozen, and the quote built on it will move when the parts do.
The motor duty cycle is not validated
A demo run is not duty validation. Run the drive at its production duty — real run time, real load — and watch the thermals and the noise. The motor that survives a two-minute demo can fail a ten-minute continuous duty, and finding that out after tooling is the expensive way.
Enclosure, tooling, and assembly are still assumptions
A printed enclosure tells you nothing about injection tooling: draft angles, wall thickness, snap fits, gate placement. Likewise, hand-fitting is not an assembly method — screws, welds, or snaps decide line time and therefore unit cost. Decide these, or the factory decides them for you inside the quote.
Tolerances, materials, and the testing path
Production needs materials specified by grade, tolerances called out on drawings a stranger can read, and a named testing and certification route for your target markets. 'Like the prototype' is not a specification.
Price and volume close the loop
Your target landed cost and first-run volume are checklist items too: they decide whether the design needs simplifying before it is worth quoting at all. A design that only works at 50,000 units is not ready for a 3,000-unit launch.
Decision rule: If any item on this checklist is still an assumption, do not ask for a production quote yet; make the redesign decision or ask for a feasibility/readiness review of that specific gap first.
The prototype-to-production checklist
- BOM frozen with production-grade parts named — no 'whatever the prototype used'
- Motor duty cycle validated at production duty: run time, thermal, noise — not just demoed
- Enclosure committed to a tooling method (injection, stamping) with draft angles and wall thickness considered
- Assembly method decided — fasteners and line steps, not hand-fitting
- Tolerances and materials production-specified on drawings a stranger could read
- Testing and certification path named for target markets (UL/ETL, CE, FCC as applicable)
- Target landed cost and first-run volume stated as numbers
- Redesign-before-quote decision made for any item above that failed
- Open questions written down for the factory or a readiness review
Common mistakes
- Treating a trade-show-ready prototype as production-ready because it looks finished.
- Quoting with the prototype's motor — a part picked for availability, not duty.
- Discovering injection-molding constraints after the tooling deposit is paid.
- Letting the factory silently re-engineer your assembly instead of deciding it yourself.
This guide is educational. It is not a manufacturing quote, certification review, legal advice, or a guarantee that a product can be built. If you want this applied to your specific product, request a human-reviewed Motor Readiness Scorecard.
Want this applied to your product?
Request a Motor Readiness Scorecard for a human-reviewed read, or start with a short, no-cost quote-readiness screen.