Does it open Bambu Studio and MakerWorld 3MF files?

Yes. Bambu Studio and Orca keep each object in its own part of the package and save even small projects in the large-archive ZIP format; both are read. A Bambu Studio project with 9 objects opened with all 9, each where the project put it. PrusaSlicer projects and the 3MF Consortium's own sample files open too.

What size is the STL?

Its real size. A 3MF states its unit, so the STL keeps the same millimetres, and a 3MF made in inches or centimetres is converted. You can also set the length of the longest side instead.

One STL, or one per object?

One STL that holds every object where the project places it, plates included. Slicers can split it back into separate objects: in Bambu Studio, Orca and PrusaSlicer, right-click the model and choose Split to objects.

No: STL holds only the shape. The viewer shows the 3MF's own colours, but multi-colour painting done in Bambu Studio, Orca or PrusaSlicer is stored in the slicer's own data and is not read. To print in several colours, keep printing from the 3MF.

Why would I need an STL?

Some slicers, CAD tools and printing services still ask for STL, and a 3MF saved by one slicer carries settings another one ignores. An STL is the plain shape that every program opens.

No. The 3MF is unpacked and read by your own browser, in the background of this tab. Nothing is sent to a server or stored.

Free browser tool

3MF to STL converter.

Turn a 3MF into an STL: a Bambu Studio, Orca or PrusaSlicer project, or a MakerWorld or Printables download, at its real size with every object included. It runs in your browser and your file never leaves your device.

Your model, on the stage

GLB, glTF, FBX, OBJ, STL, 3MF or a .zip · Up to 150 MB · No upload

Drop a model to convert it.

A .glb, .gltf, .fbx, .obj, .stl or .3mf, with its textures (or the whole folder). Check it in 3D, then download it in the format you need.

Your files stay in this browser tab.

Open a .glb, a .gltf with its files, an .fbx, .obj, .stl or .3mf, or a .zip of any of them. Select it together with the files it uses (a .gltf's .bin, an .obj's .mtl, textures), or drop the whole folder. A Mixamo character's FBX selected together with its animation FBXs becomes one GLB with every animation. Several models at once (an asset pack's folder or .zip) are converted or made smaller together and download as one .zip. Files are neither uploaded nor saved. Closing the model or leaving this page releases them.

Create a model in the studio →

How it works

Drop the .3mf. It opens in 3D with its objects, colours and size.
Keep STL for 3D printing at real size, or set the longest side, and convert.
Download the .stl and open it in any slicer or 3D program.

Going the other way? STL to 3MF packs an STL into a smaller 3MF that states its millimetres. A 3MF opens as a GLB too, for the web and AR.

More free 3D file tools

Questions

Does it open Bambu Studio and MakerWorld 3MF files?: Yes. Bambu Studio and Orca keep each object in its own part of the package and save even small projects in the large-archive ZIP format; both are read. A Bambu Studio project with 9 objects opened with all 9, each where the project put it. PrusaSlicer projects and the 3MF Consortium's own sample files open too.
What size is the STL?: Its real size. A 3MF states its unit, so the STL keeps the same millimetres, and a 3MF made in inches or centimetres is converted. You can also set the length of the longest side instead.
One STL, or one per object?: One STL that holds every object where the project places it, plates included. Slicers can split it back into separate objects: in Bambu Studio, Orca and PrusaSlicer, right-click the model and choose Split to objects.
Are colours kept?: No: STL holds only the shape. The viewer shows the 3MF's own colours, but multi-colour painting done in Bambu Studio, Orca or PrusaSlicer is stored in the slicer's own data and is not read. To print in several colours, keep printing from the 3MF.
Why would I need an STL?: Some slicers, CAD tools and printing services still ask for STL, and a 3MF saved by one slicer carries settings another one ignores. An STL is the plain shape that every program opens.
Is my file uploaded?: No. The 3MF is unpacked and read by your own browser, in the background of this tab. Nothing is sent to a server or stored.