Modelador 3D Two-Part Mold Generator

About this generator

Modelador 3D Two-Part Mold Generator turns the STL of a part you want to copy into a printable two-part mold. You upload a closed STL, which is processed in your browser, choose where the mold splits (the parting plane can move up to 200 mm either way, the main way to avoid an undercut that would lock the part in), and set the margin around the part, the wall thickness and the corner radius. It adds alignment pins with their own diameter, depth and clearance, a tapered pour funnel and one to six air vents, and can scale the cavity up to 103% or grow it by up to 1.5 mm to allow for material shrinkage.

The download contains the two halves, the assembled mold and a technical sheet. It comes from the small Brazilian studio behind the Modelador 3D Part Generator; the technical text is in Portuguese with menus partly translated, and downloads are free after registering a first name and a verified email.

The page is clear about its limits: it is meant for simple parts and test pieces, tunnels and undercuts may need inserts or extra parts, and pressure, vacuum, heated curing and industrial injection need their own design and validation. Print a small test before a full mold.

What you can make

• Two-part molds for casting resin, silicone or plaster
• Molds with alignment pins, a pour funnel and vents
• Test coupons for checking demolding

How to use Modelador 3D Two-Part Mold Generator

1. Upload the closed STL of the part you want to copy
2. Move the parting plane and set the margin, walls, pins, funnel and vents
3. Register a first name and email and download the halves and technical sheet
4. Check the STLs in your slicer and print a small test first