# GLB to 3MF Converter

> Turn GLB models into slicer-ready 3MF: millimetres, Z up, resting on the plate, with base-color materials as filament colors.

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

The converter turns glTF's metres and Y up into a 3MF in millimetres and Z up, resting on the plate. Meshes with plain base colors (no texture) become painted filament colors, up to 16, that Bambu Studio and OrcaSlicer open already assigned.

Most AI-generated GLBs color with a texture instead. Textures are not filament colors, so those come out single-color; the [AMS converter](https://printpal.io/tools/ams-converter) reduces a texture to 2 to 8 filaments for a multi-color print.

## How to convert GLB to 3MF

1. **Drop your GLB files.** Drop .glb files, including Draco, Meshopt and KTX2 compressed ones.
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 3MF options.** Keep parts as one object for a simple print, or tick separate objects to move them independently in the slicer.
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 | Material, face and painted colors become slicer filaments (up to 16). Textures and vertex colors do not, so those models come out single-color. |
| Units | Converted from metres to millimetres, so it keeps its real size. A 0.05 m part comes out 50 mm. |
| Orientation | Turned from Y up to Z up, so it stands on the plate in a slicer. |
| Objects | One object by default, or one 3MF object per part. Placed on Z = 0 and centered on a 256 mm plate. |
| Animation | Dropped: the model is written in its rest pose. |

## GLB at a glance (glTF 2.0 binary)

glTF 2.0 is the Khronos Group's "JPEG of 3D", and GLB is its single-file binary form. It is what AI 3D generators, Sketchfab downloads and web apps hand out, and it is the only common format whose units (metres) and axes (Y up) are fixed by the spec.

- **Stores:** Meshes, PBR materials, textures, animation and scenes in one binary file
- **Color:** Full: textures, base colors and vertex colors
- **Units:** Metres, fixed by the glTF spec
- **Up axis:** Y, fixed by the spec
- **File size:** Compact; Draco or Meshopt compression shrinks meshes 5 to 10 times
- **Opens in:** Web viewers, Blender, Windows, Android Scene Viewer, Godot, Unity and Unreal importers

## 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

## Tips

- **Set a size** AI models are often a metre or two across; set a target height in millimetres.
- **Check watertightness** Open the 3MF in the [3MF viewer](https://printpal.io/tools/3mf-viewer) for a mesh check.
- **Single color** Want one color? [GLB to STL](https://printpal.io/convert/glb-to-stl) is simpler.

## FAQ

### Does GLB to 3MF keep textures?

No. Textures become one color. Use the AMS converter to turn them into filaments.

### Which colors are kept?

Base colors of untextured materials, as filament colors.

### Is the 3MF to scale?

It has the GLB's size converted to millimetres. Set a height if the GLB isn't built to scale.

### 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

- [3MF to STL Converter](https://printpal.io/convert/3mf-to-stl)
- [GLB to STL Converter](https://printpal.io/convert/glb-to-stl)
- [GLB to OBJ Converter](https://printpal.io/convert/glb-to-obj)
- [GLB to glTF Converter](https://printpal.io/convert/glb-to-gltf)
- [3MF to OBJ Converter](https://printpal.io/convert/3mf-to-obj)
- [GLB to USDZ Converter](https://printpal.io/convert/glb-to-usdz)
- [STL to 3MF Converter](https://printpal.io/convert/stl-to-3mf)
- [STEP to 3MF Converter](https://printpal.io/convert/step-to-3mf)
- [3D model viewer](https://printpal.io/tools/3d-model-viewer)
- [3D model converter](https://printpal.io/tools/3d-model-converter)
- [Mesh Repair](https://printpal.io/tools/mesh-repair)
- PrintPal for LLMs: https://printpal.io/llms.txt