# 3MF to OBJ Converter

> Get 3MF models and slicer projects into Blender or any OBJ tool, with painted colors as materials and each object kept separate.

Page: https://printpal.io/convert/3mf-to-obj
Updated: 2026-11-12
Use it: open https://printpal.io/convert/3mf-to-obj in a browser and drop a file. Free, no account, files are processed locally and never uploaded.

A 3MF can hold several objects and painted colors. 3MF to OBJ keeps both: each build-plate object becomes an OBJ object, and every filament color becomes a material in the .mtl, so you get a .zip with the .obj and .mtl.

The OBJ keeps the 3MF's millimetres and Z up by default. For Blender, pick **Y up** and remember 1 unit is read as 1 metre.

## How to convert 3MF to OBJ

1. **Drop your 3MF files.** Drop .3mf files, including Bambu Studio, OrcaSlicer and PrusaSlicer projects.
2. **Check the preview.** The model appears at the size and orientation it will have. Fix the file units, up axis or size under Size, units and orientation if needed.
3. **Choose OBJ options.** Keep materials on to get a .zip with the .obj, its .mtl and textures. Pick the up axis: Y for Blender and game engines, Z for slicers and CAD.
4. **Convert and download.** One file downloads straight away. A batch gives a download per file and one .zip of all of them.

## What carries over

| | Result |
|---|---|
| Geometry | Every triangle is kept at full precision. |
| Color | Kept: material colors and textures go in a .mtl with PNG textures (you get a .zip); vertex colors are written into the OBJ. |
| Units | OBJ stores no units. The numbers stay in the unit the 3MF was read in (millimetres); you can change that in the options. |
| Orientation | Kept the way the 3MF had it. Switch to Y up (Blender, game engines) or Z up (slicers, CAD) in the options. |
| Objects | Each part stays a separate object or mesh. |

## 3MF at a glance (3D Manufacturing Format)

The 3MF Consortium (founded 2015 by Microsoft, Autodesk, HP and others) designed 3MF to replace STL for printing. Bambu Studio, OrcaSlicer and PrusaSlicer save whole projects in it: plates, painted colors and print settings alongside the meshes.

- **Stores:** A zipped XML model: shared vertices, objects with transforms, a build plate
- **Color:** Materials and per-triangle colors; slicers add painted filament colors
- **Units:** Declared in the file, millimetres by default
- **Up axis:** Z
- **File size:** Compressed, usually under half of a binary STL
- **Opens in:** Bambu Studio, OrcaSlicer, PrusaSlicer, Cura, Creality Print

## OBJ at a glance (Wavefront OBJ)

OBJ came out of Wavefront Technologies' animation software and became the plain-text lingua franca of 3D. The geometry is in the .obj; colors and texture references live in a companion .mtl file, which is why OBJs so often arrive grey.

- **Stores:** Vertices, faces (triangles, quads, n-gons), UVs and normals as text
- **Color:** Materials and textures in a separate .mtl file; vertex colors as an unofficial extension
- **Units:** None, the numbers are bare
- **Up axis:** Y by convention (Blender, Maya, most 3D apps)
- **File size:** Text: about a binary STL's size for bare geometry, up to twice that with UVs and normals
- **Opens in:** Blender, Maya, 3ds Max, ZBrush, Cinema 4D, game engines, most slicers

## Tips

- **Blender scale** Import with a scale of 0.001 to get real size in Blender.
- **Geometry only** Untick materials for a single .obj without the .mtl.
- **Projects** Bambu Studio and OrcaSlicer projects with parts in separate files are read in full.

## FAQ

### Are painted colors kept?

Yes. Each filament color becomes an OBJ material.

### Are objects kept separate?

Yes, each 3MF object is an OBJ object.

### What about print settings?

They are dropped; OBJ has nowhere to store them.

### Is the converter free? Are there limits?

Free, with no sign-up, watermark or file count limit. Batches and files of a few hundred MB work on most laptops; the only limit is your device's memory.

### Are my files uploaded?

No. Files are read and written by JavaScript and WebAssembly in your browser and never sent to PrintPal. The STEP and IGES reader is the only extra download, once, from a public CDN.

## Related

- [OBJ to STL Converter](https://printpal.io/convert/obj-to-stl)
- [3MF to STL Converter](https://printpal.io/convert/3mf-to-stl)
- [OBJ to GLB Converter](https://printpal.io/convert/obj-to-glb)
- [OBJ to 3MF Converter](https://printpal.io/convert/obj-to-3mf)
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- [STL to OBJ Converter](https://printpal.io/convert/stl-to-obj)
- [STL to 3MF Converter](https://printpal.io/convert/stl-to-3mf)
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