Upload a model.
Download the mold.
MoldCreator turns any STL into a print-ready two-part mold — cavity, alignment pins, and pour sprue included — in seconds, right in your browser.
No credit card needed · 2 tokens per mold · STL in, STL out
Everything a mold needs, automatically
You bring the shape. MoldCreator handles the mold-making engineering.
True CSG cavity
A watertight boolean kernel carves your model's exact negative into a solid block — no faked shells, a real castable cavity.
Two-part split
The block is split along the parting plane you choose — X, Y, or Z, positioned anywhere across the part.
Alignment pins
Four pins and matching sockets are added automatically so the halves click together in perfect registration.
Pour sprue
A cone-shaped pour channel is cut through the top half — ready for silicone, resin, wax, or chocolate.
Seconds, not hours
Everything runs on a WASM geometry kernel right in your browser. No queue, no upload wait, no CAD skills.
Mold library
Every generation is saved to your private history with a 3D snapshot — re-download any mold, anytime.
Three steps to a finished mold
Upload your STL
Drag any watertight model into the Studio — a figurine, a part, a heart, anything.
Tune the mold
Pick the parting axis and plane, wall thickness, pins, and sprue. Preview it live in 3D.
Generate & print
One click and 2 tokens later, download both mold halves as print-ready STLs.
Simple token pricing
Buy tokens once, spend 2 per mold. New accounts start with 6 free tokens.
Your next cast starts with one upload
Join the makers casting silicone, resin, chocolate, and concrete from molds they generated in seconds.
Create your free account