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Split3MF

Drop a 3MF, STL or OBJ here

Painted 3MF from Bambu Studio, OrcaSlicer or PrusaSlicer, or STL and OBJ

Split3MF – Free Online 3MF Splitter

What is Split3MF?

Split3MF is a browser-based 3MF splitter for makers who need to turn one model into printable pieces. You can split a painted 3MF by color, cut a model along a plane or sketch, fit an oversized design to a printer, and inspect the result before exporting.

The tool reads 3MF, STL, and OBJ files in your browser. If you need to split 3MF files, Split3MF keeps the model on your device while you choose a color split, a geometry cut, or a printer-fitting plan. Color information is available when the source contains painted regions, materials, or vertex colors that the importer can read. STL has geometry but no native color assignment, so use a geometry-based cut when the file has no colors.

How to split 3MF files online

  1. 1

    Open a model

    Drop a 3MF, STL, or OBJ file into the Split3MF workspace, or try the sample model to learn the controls.

  2. 2

    Choose a method

    Use Split3MF to choose Split colors for a painted model, Plane cut or Sketch cut for a deliberate seam, or Fit to Printer for an oversized design.

  3. 3

    Preview the pieces

    Let Split3MF preview color regions, a moved cut plane, or the planned printer cuts before changing the geometry.

  4. 4

    Prepare assembly

    Use Split3MF to add alignment pins or labels when the pieces need a repeatable orientation.

  5. 5

    Export and slice

    Download plain 3MF or STL parts from Split3MF, then check the result in Bambu Studio, OrcaSlicer, PrusaSlicer, or your preferred slicer.

Split3MF tools for every 3MF job

Split3MF Color Splitter→

Turn painted color regions into separate printable parts.

3MF Splitter→

Use one workspace for color splits, plane cuts, and exports.

Split into Parts→

Divide a model with a flat or sketched seam.

3MF Cutter→

Cut 3MF, STL, and OBJ models with a deliberate seam.

Repair 3MF→

Check suitable mesh problems before cutting.

Fit to Printer→

Plan cuts so oversized pieces fit your build volume.

Split 3MF files by color

A painted multicolor model can contain several filament colors on one connected mesh. To split 3MF by color, Split3MF follows those painted regions and closes the new cut faces so a selected color can become its own part. Very thin painted details may be pressed into the surrounding model instead of becoming a fragile standalone piece. You can undo a split in Split3MF, inspect the exploded view, and repeat the operation for the colors you want to print separately.

Open color splitting →

Cut large 3MF models into smaller parts

When you need to split 3MF into parts because a model is larger than your printer bed, use Plane cut for a predictable flat seam or Sketch cut for a custom outline. Split3MF can plan several cuts around a selected build volume with Fit to Printer and show the plan before applying it. A piece that fits the stated dimensions can still need supports, a different orientation, or a stronger joint, so preview the export and slice it before printing.

See printer fitting →

Supported 3D file formats

3MF
Best for painted multicolor projects and project structure.
STL
Geometry-only input for cutting, fitting, and repair workflows.
OBJ
Geometry with MTL materials or vertex colors when those files are supplied together.

Popular ways to split a 3MF file

How to split a 3MF in parts

If you searched for how to split a 3MF in parts, open the model, choose Plane cut or Sketch cut, preview the pieces, add connectors when needed, and export STL or plain 3MF for your slicer.

Split 3MF by color

For painted multicolor models, Split3MF works as a 3MF color splitter: it follows painted regions and lets each color become a printable part without redrawing every boundary.

3MF separator for color and geometry

A 3MF separator can mean separating painted colors or cutting a solid along a seam. Use the color tool for painted boundaries and the 3MF splitter for plane, sketch, or printer-size cuts.

How to split a 3D model into parts by color

When you need to split a 3D model into parts by color, start with a painted 3MF from Bambu Studio, OrcaSlicer, or PrusaSlicer. STL has geometry but no native color assignment.

3MF split download and slicer check

After a 3MF split, download plain 3MF or separate STL parts, then check scale, colors, orientation, supports, and the first layer in your slicer before printing.

Common problems when splitting 3MF files

No colors appear

The source may not contain painted regions or readable color data. Paint it in your slicer first, or use a plane, sketch, or printer-fitting cut.

The mesh will not cut cleanly

Open boundaries, cracks, flipped faces, or overlapping shells may need Repair & simplify before a split.

A piece is too thin

Move the seam away from a thin wall or small detail. A valid geometric cut can still make a weak print.

The export looks different

Open the downloaded file in your slicer and check scale, colors, orientation, supports, and the selected export format.

Frequently asked questions

Is my model uploaded?

No. Parsing, geometry operations, preview, and export run in the browser worker.

Can I split an STL by color?

STL does not carry native color assignments. Use a painted 3MF to split 3MF files by color, or use geometry-based cuts for STL.

Is Split3MF free?

The basic splitting, cutting, fitting, and plain STL or 3MF exports are available under the current free rules. Pro access applies to the advanced tools and downloads described on the pricing page.

Where can I learn the full workflow?

Read the How it works page and the guides for splitting a 3MF into parts or splitting a 3MF by color.

Read the full FAQ →

Explore more Split3MF workflows

Choose a focused page when you already know what you want to do. Each page explains how to split 3MF files or cut them by another method, the real tool behavior, and the limits to check before printing.

How it works →Full FAQ →Pricing →Parts guide →Color guide →