Drop a 3MF file, check the preview, download OBJ. The conversion runs in your browser, so your model never leaves your device.
Files are processed entirely in your browser. Nothing is uploaded to a server.
Any 3D edit is just a prompt away.
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3MF is the modern print format used by Bambu Studio, PrusaSlicer, and Cura. Unlike STL it stores units, colors, and multiple objects per file.
The converter writes a plain OBJ that imports cleanly into Blender, Maya, and most game engines, which makes it a practical handoff format for further editing.
Only the mesh geometry is taken from the 3MF. Slicer settings, plate layout, and metadata stay behind.
GrandpaCAD turns a text prompt into a ready-to-print 3D model. Functional parts, organic shapes, multi-color prints. No CAD skills needed.
"Phone stand with cable slot, 70mm wide, 15 degree angle"
