Silicone Mold Revision Process: What Changes After Sample Cost Extra
Silicone mold revision process after sample approval - CAD changes, master rework, re-prototype fees, and RUUIPON policy for MOQ 50 production at 3-7 day prototype cycles.
Kyler Yang · Founder5 min read
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Sample approved Friday, logo depth changed Monday - that is a revision, not a "small tweak," and it resets master work before MOQ 50 cuts. RUUIPON builds custom silicone molds at MOQ 50 with prototypes in 3-7 days. This guide classifies revision types, what bills separately, and how to lock CAD so production starts once.
Quick answer: Revisions fall into cosmetic (finish note), dimensional (CAD change >0.2 mm), and structural (cavity count, spout, keys). Cosmetic on signed sample may be free if within tolerance; dimensional and structural require master rework - typically re-prototype 3-7 days plus quoted delta. Production MOQ 50 runs only on signed Rev letter (e.g. Rev C stamped on packing list).
What Counts as a Mold Revision
A revision is any change to geometry, material spec, or QC criteria after a sample was presented for approval.
| Change type | Example | Typical action |
|---|---|---|
| Minor QC | Flash trim standard clarified | Production note - no new master |
| Dimensional | Logo 0.5 mm deeper | Master adjust + re-prototype |
| Layout | 8-cavity → 12-cavity | New master + layout proof |
| Material | Shore A 30 → 40 | New pour - same master possible |
| Process | Add vacuum degas requirement | Re-pour sample from master |
Revision Types in Detail
Class A - Documentation only. Packing list, color code, engraving text on flange. No cavity change. Production proceeds on existing approved sample.
Class B - Master touch-up. Local sand on master, flash path widen, vent enlarge 0.5 mm. Master stays; silicone re-pour 3-7 days. Low cost.
Class C - CAD geometry change. Any STP rev bump affecting cavity, draft, spacing 8-20 mm, walls 2.5-5 mm. Full or partial master rebuild. Re-prototype mandatory.
Class D - Application change. Food → non-food or reverse - new compound, possibly new certification path. Grade selection.
Workflow baseline: prototype to production. Compare vendor policies: compare quotes.
What Changes After Sample Cost Extra
| Buyer request | Why it costs |
|---|---|
| Deeper emboss +0.5 mm | Master CNC or hand cut time |
| Add registration keys | Parting line rework - registration keys |
| Move pour spout | New gate path - spout design |
| Change cavity spacing | Layout + shrink ~0.1% recalc - layout |
| Gummy weight target −0.3 g | Cavity volume reduction - cavity volume |
| Matte → gloss cavity | Master polish - surface finish |
| Colored flange | Process change - pigment |
Usually included in original quote if caught before first pour: draft correction, obvious CAD clash, standard degas 2-5 min, normal shrink compensation.
Timeline: Re-Prototype vs Production
- Class B revision - 3-5 days re-prototype after master touch.
- Class C revision - 5-7 days if master rebuild; CAD review same day.
- Production MOQ 50 - starts only after written/email approval on new sample - ~2-4 weeks mold pour + QC + pack.
- Parallel mistake - starting production before Rev sign-off - trays are scrap or dispute.
Lead time overview: lead time explained. Sample gates: sample approval checklist.
Sample Approval Gates Before You Rev Again
- Dimension - caliper critical features; note shrink ~0.1%. Shrinkage.
- Fill / weight - gummy and chocolate weigh 10 units. Fill weight.
- Demold - 5 cycles without tear. Tear strength.
- Finish - compare to reference under consistent light.
- Sign-off - email "Approved Rev B" with photo - triggers production PO.
Cost context for revisions: mold cost guide.
Production Lock at MOQ 50
| Lock item | Cannot change without new rev |
|---|---|
| CAD revision ID | STP filename rev in PO |
| Shore A | ±2 points production band only |
| Cavity count & spacing | 8-20 mm as approved |
| Material grade | FDA/LFGB doc set |
| Sample photo ID | Match signed prototype # |
MOQ 50 per locked rev. Reorder same rev - no re-prototype. Reorder changed rev - new sample cycle. [email protected] | Contact RUUIPON | WhatsApp +86 135 3006 2969.
Common Revision Process Mistakes
- Verbal "make logo pop more" - subjective; specify +0.4 mm depth on STP.
- Stacking five tweaks in one email - bundle as one Rev C, one re-prototype fee.
- Approving sample with known issue "fix in production" - production matches sample legally.
- Changing fill material after approval - demold and finish differ - re-test or rev.
- No rev ID on reorder - factory ships last approved - may not be your latest chat.
Brief completely first time: manufacturer brief. Defects vs rev: common defects.
Frequently Asked Questions
How many free revisions do mold orders include?
Typically one prototype cycle covers reasonable CAD fix if error was quoting input; buyer-driven geometry changes after sample bill as Class B/C.
How long does a revision take?
3-7 days re-prototype for most Class B/C changes.
Can I skip re-prototype and go straight to MOQ 50?
Only for Class A doc changes - never for cavity geometry.
Does revision reset MOQ?
MOQ 50 still applies per rev; previous rev inventory is separate SKU.
Shore A change - new sample?
Yes - demold feel changes; re-pour from master 3-7 days.
Who stamps revision on mold?
Optional laser/emboss on flange - specify on PO for traceability.
Revision vs warranty defect?
Defect = doesn't match signed sample; revision = you want different than signed sample.
Ready to order custom silicone molds?
Free quote for OEM/ODM projects. MOQ 20 · Prototype 3-7 days · FDA/LFGB available.