Choose a 3MF
Open a supported model from your device. No account needed.
THE 3D PRINTING TOOLKIT01 / FILE CONVERSION
3MF to STL
Converter
Convert a supported 3MF project to STL. Review parts and dimensions, then export only the parts you select.
PROCESSED ON YOUR DEVICE3MF TO STL CONVERTER01 — 02
Your model starts here
Choose a .3mf file or drop it anywhere in this area.
One .3MF file · Maximum 50 MiB (52,428,800 bytes); expanded data maximum 32 MiB. Geometry caps apply.Your file stays yours
The conversion happens on your device. Your model is not uploaded.
3D PREVIEW 3MF / STL
Your model will appear hereOpen a file to see the shape, parts and dimensions.
What STL keeps
STL keeps the shape. Colors, materials, printer settings and project details are left behind. Keep your original 3MF.
Supports 3MF Core meshes and some simple PrusaSlicer 2.9.6 projects. Some Bambu Studio projects and other slicer features are not supported.SIMPLE BY DESIGN
From one format to the next.
Check the details
Review the part count and dimensions in millimeters.
Download your STL
Export only the parts you selected as one STL or a ZIP of separate parts.
THE DETAILS
Good to know before you print.
What changes when I convert 3MF to STL?
STL contains triangle geometry. Colors, materials, printer settings and 3MF project structure are not preserved. Keep the original 3MF if those details matter.
Will the size stay the same?
Supported 3MF units and object transforms are converted to millimeter coordinates. STL does not declare a unit, so choose millimeters when importing the output.
Why was my 3MF not supported?
Some slicers add proprietary project parts, modifiers or extensions. This tool stops when it cannot safely determine what should be exported. Open the original project in its slicer and export STL there.
Does conversion repair my model?
No. Conversion changes the file format; it does not repair holes, validate manufacturing or guarantee a successful print.