Part splitting tool
Split 3MF Into Parts Online
Use the split 3MF into parts workflow when one model needs printable pieces that fit your printer and can be assembled later. Choose a flat cut for a predictable seam, or draw a sketch when the cut needs to follow a custom outline.
Choose the right cut
Plane cut is the quickest way to divide a solid with a flat, closed face. Sketch cut is useful when a straight plane would waste material or miss the shape you need. If the whole model is too large, Fit to Printer can plan several cuts around a selected build volume.
Color splitting is a different task: use it when the input is a painted multicolor 3MF and the part boundaries should follow painted regions.
A practical split 3MF into parts workflow
- Open the model and select the piece to cut in the split 3MF into parts workflow.
- Move or tilt the plane until the seam is printable and easy to assemble.
- Preview the resulting pieces and undo if a thin or fragile section is created.
- Add alignment pins after the geometry is divided.
- Export the pieces and slice them with the settings for your printer after you split 3MF into parts.
Avoid fragile parts
A mathematically valid cut can still create a weak part. Check thin walls, small contact areas, and the direction of the print layers after you split 3MF into parts. The tool reports some thin-cut conditions, but it cannot predict every printer, material, support, or assembly outcome.
Files and privacy
3MF, STL, and OBJ can be opened. The browser performs the parsing and geometry work locally, so the source model is not sent to a processing server.
How to split 3MF into parts without losing the plan
When you split 3MF into parts, start by deciding what the pieces need to do after printing. A display model may need a broad, easy-to-glue seam; a functional part may need a hidden seam and a connector; an oversized model may need several cuts that follow the printer volume. The part splitter lets you preview each choice before you export, so the split 3MF into parts workflow stays tied to the assembly plan.
Split 3MF into parts one operation at a time and keep the original model available for comparison. A cut that looks clean from the front can create a fragile tip, a narrow contact area, or a piece that cannot sit flat on the build plate. Reviewing the result after every split is faster than discovering the problem after a long print.
Part boundaries that print well
- Prefer a wide seam with enough surface area for adhesive, pins, or a stable first layer when you split 3MF into parts.
- Avoid placing a cut through a moving joint, a thin wall, or a fine detail unless the design requires it.
- Leave room for supports, a brim, and the nozzle clearance used by your slicer.
- Use a connector test before committing to a tight peg or dowel fit; 3D print connectors need a measured clearance.
- Export separate STL files when you need independent orientation, or a plain 3MF when you want the parts together in one project.
Try Split3MF in your browser
Open a real model, preview the operation, and decide what to export.
Try a sample model