Mold Studio

What is Mold Studio?

Mold Studio is a browser tool that builds a printable two-part mold around a 3D model you already have. You upload a binary STL, or load the sample rubber duck, and it tries to repair a broken mesh, suggests the cleanest split direction and adds alignment pins, a pour sprue and air vents. You print the halves, clamp them together and pour a low-temperature material such as resin or silicone.

There are three mold types. Box makes a simple block, Form-fitting wraps a tighter shell around the shape so you use less material, and Silicone mold makes an open-top pour box with flanges, clamps and a base plate that holds your master while silicone sets around it. Optional fields cover wall thickness, tolerance, pin size, vent and sprue size and position, split axis and a split ratio slider, and empty fields are sized automatically. A hollow option adds an inner core for pieces like vases, and the site says it reports the silicone volume a mold needs.

Box and form-fitting molds download free without an account, while silicone mold downloads cost a paid credit. It suits miniature makers, cosplayers and candle or soap crafters who want repeat copies of a part without boolean work in CAD. The site launched in 2026 and had no community track record as of September 2026.

What you can make

• Two-part box molds with alignment pins
• Form-fitting two-part mold shells
• Silicone pour boxes with clamps and a base plate
• Inner cores for hollow casts such as vases

How to use Mold Studio

1. Open the app and upload a binary STL, or try the sample duck
2. Choose Box, Form-fitting or Silicone mold
3. Adjust wall thickness, tolerance, pins, sprue or split axis if the preview needs it
4. Click Generate Mold and check the preview
5. Download the STL halves, print them, clamp them together and pour