Mesh convert
Upload a 3MF file (3D printing) and download it as STL.
Everything runs in your browser — your files are never uploaded. STEP/IGES use the OpenCASCADE engine (a one-time ~7 MB download) and are tessellated into a mesh, so the result is a surface model, not editable CAD history.
A 3MF to STL converter is a web-based tool that transforms 3D model files from the 3MF (3D Manufacturing Format) standard into the STL (Stereolithography) format. 3MF is a modern, XML-based format developed by Microsoft and the 3MF Consortium for precise 3D object representation, while STL is the industry-standard file format for 3D printing and CAD applications. The converter reads the 3D geometry, color data, and material properties from your 3MF file and exports them as a compatible STL file that works with virtually every 3D printer, slicer software, and CAD platform.
The converter reads the 3MF file's internal XML structure and extracts the 3D mesh geometry, vertex coordinates, and face definitions. It then reconstructs this geometry in STL format, which stores triangle-based mesh data and can optionally include color information as vertex attributes. The conversion is lossless for geometry—your model's shape, scale, and dimensions are preserved exactly. The tool runs entirely in your browser, meaning your files never leave your device and conversion happens in seconds.
| Input | Result | Notes |
|---|---|---|
| 3MF file (5 MB) with a multi-part mechanical assembly | Binary STL file (12 MB) with all parts merged and scale preserved | Binary STL is larger because it stores every triangle explicitly; assembly hierarchies are flattened into a single mesh |
| 3MF file (2.3 MB) with color-mapped polymer model | STL file (3.1 MB) with vertex color data embedded | Color information transfers as per-vertex attributes; not all STL viewers display it, but data is preserved |
| 3MF file exported from Fusion 360 CAD design | STL file ready for slicing in Cura, PrusaSlicer, or SuperSlicer | Dimensions and material thickness are maintained; file is immediately 3D-printer-ready |
Yes, geometry and scale are preserved exactly. However, you should still run the STL through a slicing software like Cura or PrusaSlicer to set print temperature, infill, support structures, and layer height before sending to your printer.
Yes, use an STL to 3MF converter. Note that STL is triangle-mesh only, so reverse conversion won't recover original CAD features (parametric sketches, constraints), just the solid shape.
Most browsers handle files up to 100–500 MB depending on available RAM. If you hit memory limits, split your assembly into separate parts and convert each.
Colour transfers as vertex attributes in the STL file, but most 3D printers and slicers ignore it—they print monochrome by default. Use multi-material printing or post-processing if colour is critical.
Entirely. Conversion runs in your browser with no server upload—your 3MF file never leaves your device, and no data is logged or stored.
Nearly all modern FDM (Fusion Deposition Modeling), SLA (resin), and industrial 3D printers accept STL. Universal CAD packages (Fusion 360, FreeCAD, SolidWorks, AutoCAD) and slicers (Cura, PrusaSlicer, Simplify3D) all import STL natively.