One-Piece vs Split Silicone Mold: When Undercut Forces the Split

The render has a hooked tail. The one-piece tray tears the tail off on demold 2. You ask for a softer Shore. Soft Shore does not delete a hook. Split vs one-piece is a geometry call we make before CAD lock, not after you hate the sample.

RUUIPON, Shenzhen since 2018. MOQ 20. Prototype 3-7 days after CAD lock. We will recommend fillet, flatten, or split. We will not pretend Shore A 20 saves a 25 degree hook.

Lock Is an Undercut Budget, Not Bad Silicone

Platinum-cure production sheets still lock if the part cannot leave along a draft vector. Craft buyers send jewelry STLs with bail hooks and expect a cookie-tray demold. We mark undercuts in CAD and send you a screenshot before we cut. If you say "keep the hook," we quote a split or a redesign of the hook into a fillet you can live with on the listing photo.

Decision Table Before We Cut

Geometry	Usual path
Draft 1-3 deg, no hook	One-piece
Shallow logo islands	One-piece if islands have meat
Hook / barb / closed loop	Split or redesign the loop
Jewelry bail <1.2 mm	We push back even on a split
Deep character with ear undercut	Split or flatten the ear

Related jewelry cavities: resin jewelry SKU. Terrain cobbles: terrain bases. Manufacturer: custom silicone mold manufacturer.

Split Flash vs One-Piece Tear

A split that is not tooled to the parting line you approved will flash. Buyers then spray release into a food-looking cavity and make a second problem. If the SKU is edible, food-contact and flash are both on the quote. Craft resin can sand flash; chocolate cannot. Say the pour before we pick the split plane.

How to Mark Undercuts on the RFQ

STL/STEP in mm. Screenshot of the hook. Whether the listing photo can lose 0.3-0.5 mm of undercut. Pour chemistry and peak C. Cavity count. quote or WhatsApp +86 135 3006 2969.

FAQ

Is a two-part chocolate mold the same as a resin split?
Same word, different flash and food rules. Name the pour.

Can you hide the split on the back?
Often. Put the pretty face on the cavity that must photograph.

MOQ for a split tool?
Still MOQ 20 trays per design. The split is the design.

Quote: contact.