Kept
- Tessellated geometry of each solid
- Millimetres declared in the package
- One object per solid
Runs locally · no upload
Convert STEP to 3MF
Turn a STEP solid into a 3MF package modern slicers read natively. Tessellation flattens curves, but the unit, object structure and colours survive.
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- 5 credits per file
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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
- Exact B-Rep surfaces
- Parametric history and features
- PMI annotations
Common mistakes
- A STEP with only sketches, points or lines has no surface to tessellate.
- Large assemblies can exceed the 60-second browser limit; convert one part at a time.
- Invalid or encrypted STEP files are rejected.
For 3D printing
- 3MF declares millimetres, so the scale is explicit in the slicer.
- Check curved walls and threads: tessellation flattens them.
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
Is 3MF better than STL for a STEP file?+
For modern slicers yes: the unit is declared, objects keep their names and colours can be carried.
Does the conversion keep exact CAD surfaces?+
No. 3MF stores a mesh here; the exact B-Rep surfaces and features are lost during tessellation.
Can I convert a whole assembly?+
Yes, but heavy assemblies are slow in the browser. Convert one part at a time for a print.
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.