How to convert 3MF to STL
- Click Choose 3MF or drop your file — it's processed in the browser, never uploaded.
- Check the model in the preview and its dimensions.
- Click Convert to STL.
- Download the STL and open it in your slicer.
3MF to STL Converter Online
Upload a 3MF — the tool previews the model and converts it to STL right in your browser. Your file never leaves your device.
How 3MF differs from STL
3MF is a modern format (a zip): it stores geometry, colors, multiple objects and print settings, and is produced by Bambu Studio and OrcaSlicer. STL stores only triangles — no color, no units. Converting 3MF to STL keeps the geometry; color and metadata are not carried over, and multiple objects are merged into one mesh.
FAQ
Is the file uploaded to a server?
No. Conversion happens entirely in your browser — the file never leaves your device.
Are colors and multiple objects kept?
STL stores geometry only, so color and metadata are dropped and multiple objects are merged into one mesh.
Is the scale preserved?
Yes, millimeter dimensions are preserved.
What file sizes are supported?
Up to 150 MB. Larger files take longer to process.
What opens a 3MF?
Slicers open 3MF (Bambu Studio, OrcaSlicer, PrusaSlicer). If you need an STL, convert it here.
