Convert 3MF to STL
Convert a 3MF file to STL in your browser. Free, no upload, no sign-up.
Convert 3MF files to STL directly in your browser. The converter parses the 3MF mesh, rebuilds it in memory and writes it out as STL, keeping every triangle. Nothing is uploaded, there is no file size limit beyond your computer's memory, and the result downloads instantly. STL is accepted by every slicer and 3D printer, so it is the safest format to hand to anyone who needs to print your model.
How to convert 3MF to STL
- 1Drop your 3MF file
Drag a .3mf file onto the box above or click to choose one. Slicer project files (.3mf from Bambu Studio or PrusaSlicer) are supported; embedded print settings are ignored, geometry and colors are read.
- 2Check the preview
The model renders in 3D so you can confirm it loaded correctly. Dimensions, volume and triangle count are shown next to it; open edges are flagged if the mesh is not watertight.
- 3Download the STL
Adjust the export options if needed and click download. Colors, textures and materials are dropped because STL cannot store them. Multiple objects are merged into one triangle soup; units are not recorded, so make sure the model is already in millimeters.
What is a 3MF file?
3MF is the modern replacement for STL, published by the 3MF Consortium (Microsoft, Autodesk, HP, Prusa and others). It is a ZIP archive containing XML that stores units, colors, materials, multiple objects and print settings. Slicers such as Bambu Studio and PrusaSlicer use it as their project format.
Commonly used by: Bambu Studio, PrusaSlicer, Cura, Windows 3D Builder, Fusion 360
Slicer project files (.3mf from Bambu Studio or PrusaSlicer) are supported; embedded print settings are ignored, geometry and colors are read.
What is a STL file?
STL is the oldest and most widely supported 3D printing format. It stores nothing but a list of triangles, with no color, texture, unit or scale information. Every slicer and almost every 3D tool can read it, which is why it is still the default exchange format for printable models.
Commonly used by: 3D printer slicers (Cura, PrusaSlicer, Bambu Studio), CAD export, Thingiverse / Printables
STL is accepted by every slicer and 3D printer, so it is the safest format to hand to anyone who needs to print your model.
3MF vs STL
| 3MF | STL | |
|---|---|---|
| Full name | 3D Manufacturing Format | Stereolithography |
| Encoding | ZIP container | Text or binary |
| Geometry type | Triangle mesh | Triangle mesh |
| Colors | Yes | No |
| Textures | Yes | No |
| Materials | Yes | No |
| Stores units | Yes | No |
| Multiple objects | Yes | No |
| Typical use | Bambu Studio, PrusaSlicer, Cura | 3D printer slicers (Cura, PrusaSlicer, Bambu Studio), CAD export, Thingiverse / Printables |