PrintPal Mold Box Generator

What is PrintPal Mold Box Generator?

PrintPal's Mold Box Generator builds the printed box you pour silicone or resin into around a master model. You upload an STL, OBJ, GLB or GLTF, and the tool centers it, measures its bounding box, adds a clearance gap and builds outer walls around it. The box is split into a top and bottom half along a plane you choose, so you can open it and get the master out after the silicone cures.

You set wall thickness (5 mm by default), clearance (1 mm), base thickness (4 mm), the split position and axis, and add alignment keys as pegs and sockets, a pour spout and air vents, each with its own diameter. The preview shows the mold assembled, exploded or with the model alone, and readouts give the outer size, split height and an estimate of how much silicone you need. Each half downloads as a separate STL, or both at once. The FAQ suggests platinum-cure silicone of Shore 15A to 30A, mold release on the box and master, and printing each half with the flat split face down.

The page says the tool is free with no signup, no watermarks and no limits, and your model never leaves your device. It pitches itself as a free alternative to Moldboxer, a paid desktop app. Note that it prints the box, not the mold itself: the silicone makes the mold. It suits resin and silicone casters who want a box that fits the model instead of a square frame.

What you can make

• Two-part mold boxes for silicone casting
• Formwork for resin casting
• Mold boxes with alignment keys, pour spout and vents

How to use PrintPal Mold Box Generator

1. Upload your master model as STL, OBJ or GLB
2. Set the walls, clearance and split position
3. Add alignment keys, a pour spout and vents
4. Click Export All STL, print both halves and pour the silicone