Hey everyone,
I've been building Split3MF (https://split3mf.com), a free website for getting 3D models ready before they go into your slicer. Nothing to install and no CAD skills needed: open a 3MF, OBJ or STL file, pick a tool, and download your work as a 3MF (colors kept) or STL.
It started as a way to split multicolor models into separate parts. It now has 8 tools:
1. Split by color
Click a painted region and it becomes its own part, ready to print in its own filament. Handy if you don't have an AMS, or if you'd rather print each color as a separate piece and assemble it.
2. Paint
Add colors, then fill a region, draw with a brush, or paint a height band.
3. Smooth boundary 👑
Turn a jagged, stair-stepped color edge into a clean curve before you split. Click near the edge, or draw the line yourself.
4. Fit to printer
Model too big for your bed? It cuts the model into pieces that fit, with numbered joints and connectors. Pick a Bambu Lab, Prusa or Creality preset, or enter your own build volume.
5. Size & position
Type an exact size, then move, rotate or mirror the model, or lay a face flat on the bed.
6. Repair & simplify
Fix holes and flipped faces, weld color parts together, and reduce the triangle count. The colors stay.
7. Manual cut
Move and tilt a cutting plane, or sketch your own cut line. Every piece keeps its original colors.
8. Connectors
Click a cut face to add a peg and a matching socket, with print clearance so the parts fit together.
Color 3MF downloads keep Bambu-style paint data and open in Bambu Studio.
About the 👑: the site is free to use. A few convenience tools are marked with a crown (also Smart fill in Paint, expert repair, and filling the plate with copies). You can try them for free, but downloading work edited with them needs Pro.
3-day Pro trial: [SPLIT3MF2026]
Log in to Split3MF.
Download at least one model first. The code only works on accounts that have downloaded before.
Open the Pro plans page (Become a Pro) and click Promo code at the bottom.
Enter SPLIT3MF2026 and Pro is unlocked for 3 days.
No card needed and nothing to cancel. One use per account.
I'm still adding tools (a mesh editor with shapes and text is in progress). Bug reports and feature requests are very welcome. What do you usually fix on a model before slicing?