Build 3D shapes, combine them, and export a real .stl file ready for any 3D printer — right in your browser, free.
This live walkthrough uses the real Model Forge controls to add two shapes, combine them, inspect the wireframe and prepare the model for STL export.
All sizes are in millimetres — export scale matches most slicers' default units.
No shapes yet — add one above to get started.
Subtract removes Shape B's volume from Shape A — useful for cutting a hole.
Select a shape to edit its size and position.
Exports every visible shape as one file. Open the .stl in any slicer (Cura, PrusaSlicer, Bambu Studio, etc.) to print it.
Model Forge builds 3D shapes, combines them with union, subtract and intersect, and exports a real STL file for any 3D printer's slicer.
Yes. Export an STL file and open it in your printer's slicer.
Yes. It is free to use, with no account, no watermark and no paywall.
No. It runs entirely in your browser, so your files and text stay on your device.
Related tools: CAD Forge · 3D Game Forge · Boat Forge