How are parts detected?

Triangles are grouped by shared edges. The result reports the component count and the number of triangles in each part.

Does it split at a plane?

Not in this tool. It splits edge-connected components; plane cutting and boolean splitting are separate operations.

What is inside the ZIP?

One binary STL per component, named part-001.stl, part-002.stl, and so on. No materials or colors are added.

How does the tool decide which triangles form a part?

It groups triangles connected through shared edges, not by proximity. Parts that touch only at a vertex or overlap without shared edges stay separate.

Are part positions preserved?

Yes. Each part keeps its original world coordinates and is exported as a separate STL inside the ZIP; no recentering is applied.

Transform & optimize/Optimize

Split mesh into parts (local)

Split a mesh into edge-connected parts and download them as separate binary STL files in one ZIP. The Worker accepts STL, OBJ, PLY, 3MF, GLB, or self-contained glTF and never uploads the model.

ReadyNo uploadWorkerSTL · OBJ · PLY · 3MF · GLB · glTF

Tool facts

Formats: STL · OBJ · PLY · 3MF · GLB · glTF
Output: Archive
Worker: Yes
Max file: 500 MB
Runs: in your browser

Why local

Split mesh

No upload

Split mesh

Components are connected through shared edges; islands that only touch at a vertex become separate parts. The ZIP contains stored binary STL files named part-001, part-002, ….

Drop a mesh to split

STL, OBJ, PLY, 3MF, GLB, or a self-contained glTF. Edge-connected components are written as separate STL files in a ZIP.

Drop a mesh to split

STL, OBJ, PLY, 3MF, GLB, or a self-contained glTF. Edge-connected components are written as separate STL files in a ZIP.

Choose a file

Max file size: 500 MB · No upload

No upload · File.slice() / ArrayBuffer → Worker → parts ZIP.

How it works

1
Drop a mesh file in any supported format.
2
The Worker parses the mesh, welds unindexed sources if needed, and groups triangles that share edges.
3
Each component is written as a separate part-NNN.stl inside a ZIP.
4
Download the parts ZIP locally. No upload is performed.

What the numbers mean

Components

Components are connected through shared edges. Two surfaces that only touch at a vertex, or do not touch at all, become separate parts. Non-manifold connections remain in one component.

Output

The ZIP contains stored binary STL files named part-001.stl, part-002.stl, and so on. Each part keeps its original coordinates; no recentering or scaling is applied.

Printing notes

Use separate parts when the slicer needs distinct objects; run manifold-check on each part if needed.
Parts may overlap in the original coordinate space; arrange them before printing.
Keep the original source until the split ZIP is verified.

Questions

References

· ISO/ASTM 52900
· Mesh connectivity and connected components