When to Redesign Before Manufacturing Quote
When to Redesign Before Manufacturing Quote Sending an RFQ when the design has a known gap is a common mistake. The factory returns a number; the number is wrong; you negotiate; eventually you discover the real problem was a design assumption, not a supplier relationship.
Sending an RFQ when the design has a known gap is a common mistake. The factory returns a number; the number is wrong; you negotiate; eventually you discover the real problem was a design assumption, not a supplier relationship. The four conditions below are the ones that make a redesign before the quote cheaper than a re-quote after it — and each has a clear signal that fires before the RFQ goes out.
Why this matters
A re-quote after tooling is paid for is expensive in two ways: the tooling cost you already spent, and the redesign cost on top of it. Both are avoidable by running four checks before the first RFQ. These checks take days of design work, not weeks.
A re-quote after tooling is paid for is expensive in two ways: the tooling cost you already spent, and the redesign cost on top of it. Both are avoidable by running four checks before the first RFQ. These checks take days of design work, not weeks.
The reason most founders skip the pre-quote redesign check is that the design feels done. A working prototype is real evidence of progress — it is not evidence that the design is ready to quote, and those are different bars.
Condition 1 — Motor duty mismatch
If your motor assumption is wrong — the wrong duty cycle, the wrong power, a noise level the motor cannot hit — the quote is priced on the wrong motor. Finding this out after tooling means re-tooling for a different motor mount and possibly a different enclosure geometry.
If your motor assumption is wrong — the wrong duty cycle, the wrong power, a noise level the motor cannot hit — the quote is priced on the wrong motor. Finding this out after tooling means re-tooling for a different motor mount and possibly a different enclosure geometry. Finding it before the RFQ means one design iteration. Signal: test the assumed motor at production duty (real run time, real load) and measure thermal and noise against spec.
Condition 2 — BOM above target price before supplier margin
Build a rough BOM before the RFQ: motor, enclosure, tooling amortized over first-run volume, assembly, materials. If the rough BOM is already above your target landed cost before supplier margin or certification cost, the design needs simplification — not a tighter supplier negotiation.
Build a rough BOM before the RFQ: motor, enclosure, tooling amortized over first-run volume, assembly, materials. If the rough BOM is already above your target landed cost before supplier margin or certification cost, the design needs simplification — not a tighter supplier negotiation. A negotiation cannot close a gap that starts before the factory's margin.
Condition 3 — Tooling method incompatibility
Review the design against the intended tooling method before the RFQ. Injection molding requires draft angles, minimum wall thickness, and gate placement that constrain geometry in ways 3D printing does not. A design that can be printed but cannot be injection-molded at your tolerance needs a tooling-method review before the quote, not after the factory flags the problem inside the.
Review the design against the intended tooling method before the RFQ. Injection molding requires draft angles, minimum wall thickness, and gate placement that constrain geometry in ways 3D printing does not. A design that can be printed but cannot be injection-molded at your tolerance needs a tooling-method review before the quote, not after the factory flags the problem inside the quote.
Condition 4 — Uncertifiable materials or geometry for target markets
If the product uses a material not approved for food contact, skin contact, or electrical insulation in your target markets — or a geometry that cannot pass electrical clearance requirements — the certification path is blocked. This surfaces as a re-quote when the factory discovers it, or as a certification failure later.
If the product uses a material not approved for food contact, skin contact, or electrical insulation in your target markets — or a geometry that cannot pass electrical clearance requirements — the certification path is blocked. This surfaces as a re-quote when the factory discovers it, or as a certification failure later. Checking the target-market certification requirements against the design before the RFQ costs a design review; discovering it after tooling costs the tooling.
Decision rule: If any one of the four conditions applies — motor duty mismatch, BOM above target before margin, tooling incompatibility, or uncertifiable material — redesign first. The redesign is days of work; the re-quote after tooling is weeks and real money.
Pre-RFQ redesign decision checklist
- Motor tested at production duty: run time, load, thermal measurement, and noise compared against spec
- Rough BOM built: motor, enclosure, tooling amortized over first-run volume, assembly, materials
- BOM total compared against target landed cost before supplier margin — if above, redesign first
- Design reviewed against intended tooling method: draft angles, wall thickness, gate placement for injection mold
- Materials checked for target-market certification compatibility: food contact, skin contact, electrical insulation grades
- Electrical geometry reviewed for clearance requirements per target-market certification standard
Common mistakes
Treating a working prototype as proof the design is ready to quote — function and quote-readiness are different bars. Sending the RFQ and hoping the factory will flag design problems in the quote — they will price them instead. Running the BOM at target volume without including tooling amortization — tooling moves the unit cost at low volume.
- Treating a working prototype as proof the design is ready to quote — function and quote-readiness are different bars.
- Sending the RFQ and hoping the factory will flag design problems in the quote — they will price them instead.
- Running the BOM at target volume without including tooling amortization — tooling moves the unit cost at low volume.
- Discovering a material certification issue after tooling is paid because it seemed like a detail.
Frequently asked questions
- Why this matters?
- A re-quote after tooling is paid for is expensive in two ways: the tooling cost you already spent, and the redesign cost on top of it. Both are avoidable by running four checks before the first RFQ. These checks take days of design work, not weeks.
- What is condition 1 — motor duty mismatch?
- If your motor assumption is wrong — the wrong duty cycle, the wrong power, a noise level the motor cannot hit — the quote is priced on the wrong motor. Finding this out after tooling means re-tooling for a different motor mount and possibly a different enclosure geometry.
- What is condition 2 — bom above target price before supplier margin?
- Build a rough BOM before the RFQ: motor, enclosure, tooling amortized over first-run volume, assembly, materials. If the rough BOM is already above your target landed cost before supplier margin or certification cost, the design needs simplification — not a tighter supplier negotiation.
- What is condition 3 — tooling method incompatibility?
- Review the design against the intended tooling method before the RFQ. Injection molding requires draft angles, minimum wall thickness, and gate placement that constrain geometry in ways 3D printing does not. A design that can be printed but cannot be injection-molded at your tolerance needs a tooling-method review before the quote, not after the factory flags the problem inside the.
- What is condition 4 — uncertifiable materials or geometry for target markets?
- If the product uses a material not approved for food contact, skin contact, or electrical insulation in your target markets — or a geometry that cannot pass electrical clearance requirements — the certification path is blocked. This surfaces as a re-quote when the factory discovers it, or as a certification failure later.
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.