3MF to STL converter

Drop a 3MF file, check the preview, download STL. The conversion runs in your browser, so your model never leaves your device.

Convert the attached 3MF file to STL

Files are processed entirely in your browser. Nothing is uploaded to a server.

Any 3D edit is just a prompt away.
Try the full chat free

How the conversion works

3MF is the modern print format used by Bambu Studio, PrusaSlicer, and Cura. Unlike STL it stores units, colors, and multiple objects per file.

The converter writes binary STL, which is what slicers expect. Drop the result straight into Bambu Studio, PrusaSlicer, Cura, or any other slicer.

Only the mesh geometry is taken from the 3MF. Slicer settings, plate layout, and metadata stay behind.

Frequently asked questions

Does my file get uploaded?

No. Parsing and export run in your browser with WebAssembly and three.js. The file stays on your device, and it works offline once the page has loaded.

What survives the 3MF to STL conversion?

Geometry comes through completely: every triangle, at full precision. Materials, textures, and vertex colors are dropped, because STL as written here stores plain triangles only.

Is there a file size limit?

Files up to 300 MB and 8 million triangles work. Heavier meshes take longer rather than failing outright; if a file is unwieldy, reduce its triangle count first with the reduce tool.

More 3MF conversions

3MF → OBJ 3MF → GLB All converters

More free 3D file tools

View a model Repair a model Reduce file size Convert 3D files Measure a model Scale a model Split a model Mirror a model Print weight & cost

Describe a part. Get a printable model.

GrandpaCAD turns a text prompt into a ready-to-print 3D model. Functional parts, organic shapes, multi-color prints. No CAD skills needed.

"Phone stand with cable slot, 70mm wide, 15 degree angle"

Generate your first model3 free generations, no card required

Back to Tools