Open a 3MF file
Drop the .3mf and every object in it opens as its own part, where the program that made it put it — from Bambu Studio, PrusaSlicer, OrcaSlicer, Cura, 3D Builder or a CAD program. Units in the file (inches, centimetres) are converted to millimetres.
No server processing
No account
No daily limits
Saves model files for your slicer, never printer code. Opened and sliced in PrusaSlicer, OrcaSlicer, Bambu Studio and Cura.
What a .3mf file is
3MF is the newer 3D printing format, made by a group of companies including Microsoft, Autodesk and HP. It is a zip of XML files: each point is stored once and triangles refer to points by number, so the model stays exactly closed; the file names its units and can hold several objects, and slicers add their own settings and plates to it.
A 3MF from a slicer is a whole project, and sometimes you only need the shapes out of it — as STL for another program, or to cut or repair one part. Objects split over several files inside the package, as Bambu Studio and PrusaSlicer save them, are put together here as well.
What you can do here
Repair that keeps the shapeHoles are closed along their own edges and flipped triangles are turned, rather than rebuilding the model out of voxels — the surface stays where it was. Checked with PrusaSlicer on real broken models from Thingi10K.
Cuts that fit back togetherCut along any axis or at any angle and add round or square pegs — two or more, so the parts cannot twist — with a gap you choose for your printer. If the cut face is too narrow for the size you set, smaller pegs are used and you are told. Or holes in both parts and separate pins.
Solid geometry, not guessesCombine, subtract and cut run on Manifold, the open-source geometry library OpenSCAD and Blender use for the same job — the result is always a closed, printable solid.
Made for your slicer, not your printerIt saves model files, never printer code: temperatures, speeds and the G-code come from your own slicer and printer profile, and nothing here changes them. Saved files were opened and sliced in PrusaSlicer 2.9, OrcaSlicer 2.4, Bambu Studio 2.8 and Cura 5.13 — 3MF with painted colours, STL, OBJ and STEP (Cura reads no STEP on its own). As with any model, look at the slicer preview before you print.
Nothing to installWorks on Windows, Mac, Linux and a Chromebook, where Meshmixer and 3D Builder do not and where Bambu Studio cannot repair a model. The model never leaves your browser — nothing is uploaded.
Convert 3MF to something else
Questions
- Are print settings and colours kept?
- No — only the shapes are read and written. Slicer settings, plates, supports painted on and colours stay in the original file.
- Why save as 3MF rather than STL?
- 3MF keeps every part separate and every point exact, and is usually under half the size. STL is the one to pick when a program does not read 3MF.
