Split STL and 3MF models into printable parts
Multipart3D is a free browser tool to split STL and painted 3MF models into printable parts. Cut a 3D model, add connectors, and export meshes for your slicer. No signup, no install, and no file uploads.
Cut STL files online without CAD
Slicers prepare a print. They rarely let you reshape the mesh. If a download from Printables, MakerWorld, or Thingiverse is too large for the build volume, needs fewer supports, or should print in separate colors, you should not need Blender or CAD for a short cut.
Multipart3D cuts meshes in the browser with planar cut, area cut, dovetail joints, and smart detach to peel a clicked feature. Export STL or 3MF parts and slice them in Bambu Studio, Orca Slicer, PrusaSlicer, or Cura.
Why split a 3D model before printing
Oversized geometry is only one reason to split a 3D model. Makers also cut prints to:
- Fit a helmet, prop, or terrain piece on a 180 to 256 mm bed
- Print overhangs as separate parts with a flat base and fewer supports
- Stand a face or logo upright for cleaner layer lines
- Print colors or materials as separate parts
- Align layer direction with load so functional parts are stronger
- Isolate a fragile piece so a break is a reprint, not a whole model
A build-volume overlay shows whether the parts will fit your printer before you commit the cut.
Dovetail joints and connectors that lock parts together
A split is only useful if the parts assemble. After a cut you can place dowels, plugs, snap-fits, pin holes, and magnet connectors on the mating faces, with tolerances aimed at FDM printers. Dovetail cuts put interlocking teeth in the seam so large props and cosplay pieces self-align instead of sliding on a flat glue face.
Split painted 3MF by color on your device
Import painted 3MF from Bambu Studio, Orca Slicer, and PrusaSlicer. Color-separate (beta) detaches a painted region so you can print multi-color and multi-material parts without painting the mesh twice. Loading, cutting, and export all run in the browser tab. Files never leave your device. See how privacy is built into the tool.
Walk through each tool in the features overview, or read about the project.
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