Use the 3MF ⇄ STL Converter
Convert 3MF to STL or STL to 3MF in your browser. Reads multi-object 3MF files from Cura, PrusaSlicer, Bambu Studio and OrcaSlicer with their build.
- Free to use
- No signup
- Nothing to install
- Runs in your browser
A Bambu Studio plate with three parts exported as 3MF converts to one STL containing all three parts at their plate positions; an inch-unit 3MF produces an STL whose dimensions are multiplied by 25.4 to millimetres.Open the 3MF ⇄ STL Converter
Illustration. Open the tool for the real thing.
What is the 3MF ⇄ STL Converter?
3MF is the modern replacement for STL: it is a compressed package with real units, multiple objects and build transforms, and every current slicer uses it. But many tools, older slicers and CAD packages still only accept STL — and some people want 3MF to keep units and multiple parts together. This converter reads and writes both properly.
On reading, it parses the whole 3MF package — including objects made of components, build-item transforms and the 'production extension' used by Bambu Studio and OrcaSlicer — so the STL you get has every part placed exactly where the slicer plate had it. On writing, it produces a standards-compliant 3MF with millimetre units that opens in Cura, PrusaSlicer, Bambu Studio, Orca and Windows 3D Builder.
3 steps to your result
Open the tool and follow along. Nothing to install.
What you get
Merges all build items with their transforms, so the plate layout is preserved.
Handles component references and external object files used by modern slicers.
Reads inch, cm or metre 3MF files and converts to millimetres.
Convert several files at once and download them together.
AZRS tools are free to open and use.
It opens in your browser, so there is nothing to download.
Used for
Pick one to see how it fits.
Makers moving between slicers
Open a Bambu or Orca project in a slicer that only reads STL.
Try it freeHow it compares
A plain look at this tool next to the usual alternative.
| This 3d tool | Desktop software | |
|---|---|---|
| Install | Nothing to install | Usually an app or program to install |
| Account | No signup | Depends on the product |
| Cost | Free to use | Free or paid, depends on the product |
| Where it runs | In your browser tab | On your computer |
Questions people ask
Does it keep colours and materials?
No — the converter outputs geometry only; STL cannot store colours.
Is a 3MF with several objects supported?
Yes. All build items are merged with their transforms. Use STL Merge & Split afterwards to separate them again.
Is 3MF better than STL?
For most uses yes: it is smaller, stores units and supports multiple objects, and is the default in Bambu Studio, Orca and Cura.
Is my file uploaded?
No, everything is processed locally.
How do I use the 3MF ⇄ STL Converter?
1. Drop in a .3mf (or .stl) file. 2. Check that the output is the format you want (it flips automatically). 3. Press Convert and review the preview. 4. Download the converted file.
More free tools
Related to the 3MF ⇄ STL Converter.
Try the 3MF ⇄ STL Converter now
Convert 3MF to STL and STL to 3MF, including multi-object slicer files. Free to use.
Try it free