Kept
- Triangles and object groups
- Shape and dimensions
- A 3MF package with millimetres
Runs locally · no upload
Convert OBJ to 3MF
Pack an OBJ mesh into a 3MF that modern slicers read natively. Object groups become separate objects, the unit is declared in millimetres, and materials stay behind.
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Drop a 3D file hereSTL, OBJ, PLY, GLB, glTF, 3MF or STEP · up to 100 MB · processed locallyYour file never leaves this browser.
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What changes in the conversion
Dropped
- MTL materials and textures (not loaded)
- OBJ comments and smoothing groups
- Unit metadata: OBJ has none
Common mistakes
- OBJ has no unit: the 3MF declares millimetres, so check the scale before printing.
- OBJ n-gons are triangulated on export.
- Files above 100 MB are refused.
For 3D printing
- 3MF declares units and objects, which Bambu Studio and PrusaSlicer use.
- Check the scale: an OBJ authored in metres becomes a metre-sized millimetre model.
Drop the file — it is read locally, never uploaded.
Choose the options, then convert or compress.
Download the result and open it in your slicer or 3D software.
Frequently asked questions
Does OBJ to 3MF keep materials?+
No. The OBJ loader reads geometry only; MTL and textures are not loaded.
Is 3MF better than OBJ for printing?+
Yes: slicers read 3MF directly, with units and objects. OBJ is an editing format.
Why is my model the wrong size?+
OBJ has no unit and 3MF declares millimetres; scale the model in your slicer if it was authored in metres.
Need a model instead of a conversion?
Turn a photo, a drawing or a logo into a 3D model, then export it in the format you need.