3MF to OBJ Converter

Get 3MF models and slicer projects into Blender or any OBJ tool, with painted colors as materials and each object kept separate.

  • Files stay on your device
  • Free, no sign-up
  • Units and up axis handled
  • Batch and .zip

Drop a 3MF file to convert

One file, many, or a .zip

In: STL · STEP · IGES · OBJ · 3MF · GLB · glTF · PLY · FBX · DAE · 3DS · AMF · VRML · ZIP

Converted on your device. Nothing is uploaded.

    How to convert 3MF to OBJ

    1. Drop your 3MF files

      Drop .3mf files, including Bambu Studio, OrcaSlicer and PrusaSlicer projects.

    2. Check the preview

      The model appears at the size and orientation it will have. Fix the file units, up axis or size under Size, units and orientation if needed.

    3. Choose OBJ options

      Keep materials on to get a .zip with the .obj, its .mtl and textures. Pick the up axis: Y for Blender and game engines, Z for slicers and CAD.

    4. Convert and download

      One file downloads straight away. A batch gives a download per file and one .zip of all of them.

    What carries over from 3MF to OBJ

    Worked out from what each format can store and what this converter writes. Nothing is changed silently: the preview shows the size and orientation before you download.

    Geometry Every triangle is kept at full precision.
    Color Kept: material colors and textures go in a .mtl with PNG textures (you get a .zip); vertex colors are written into the OBJ.
    Units OBJ stores no units. The numbers stay in the unit the 3MF was read in (millimetres); you can change that in the options.
    Orientation Kept the way the 3MF had it. Switch to Y up (Blender, game engines) or Z up (slicers, CAD) in the options.
    Objects Each part stays a separate object or mesh.

    3MF to OBJ: what actually happens

    A 3MF can hold several objects and painted colors. 3MF to OBJ keeps both: each build-plate object becomes an OBJ object, and every filament color becomes a material in the .mtl, so you get a .zip with the .obj and .mtl.

    The OBJ keeps the 3MF's millimetres and Z up by default. For Blender, pick Y up and remember 1 unit is read as 1 metre.

    3MF at a glance

    3D Manufacturing Format · .3mf

    Stores
    A zipped XML model: shared vertices, objects with transforms, a build plate
    Color
    Materials and per-triangle colors; slicers add painted filament colors
    Units
    Declared in the file, millimetres by default
    Up axis
    Z
    File size
    Compressed, usually under half of a binary STL
    Opens in
    Bambu Studio, OrcaSlicer, PrusaSlicer, Cura, Creality Print

    The 3MF Consortium (founded 2015 by Microsoft, Autodesk, HP and others) designed 3MF to replace STL for printing. Bambu Studio, OrcaSlicer and PrusaSlicer save whole projects in it: plates, painted colors and print settings alongside the meshes.

    Open 3MF files in the viewer

    OBJ at a glance

    Wavefront OBJ · .obj

    Stores
    Vertices, faces (triangles, quads, n-gons), UVs and normals as text
    Color
    Materials and textures in a separate .mtl file; vertex colors as an unofficial extension
    Units
    None, the numbers are bare
    Up axis
    Y by convention (Blender, Maya, most 3D apps)
    File size
    Text: about a binary STL's size for bare geometry, up to twice that with UVs and normals
    Opens in
    Blender, Maya, 3ds Max, ZBrush, Cinema 4D, game engines, most slicers

    OBJ came out of Wavefront Technologies' animation software and became the plain-text lingua franca of 3D. The geometry is in the .obj; colors and texture references live in a companion .mtl file, which is why OBJs so often arrive grey.

    Open OBJ files in the viewer

    Tips for 3MF to OBJ

    Blender scale

    Import with a scale of 0.001 to get real size in Blender.

    Geometry only

    Untick materials for a single .obj without the .mtl.

    Projects

    Bambu Studio and OrcaSlicer projects with parts in separate files are read in full.

    3MF to OBJ FAQ

    Are painted colors kept?
    Yes. Each filament color becomes an OBJ material.

    Are objects kept separate?
    Yes, each 3MF object is an OBJ object.

    What about print settings?
    They are dropped; OBJ has nowhere to store them.

    Is the converter free? Are there limits?
    Free, with no sign-up, watermark or file count limit. Batches and files of a few hundred MB work on most laptops; the only limit is your device's memory.

    Are my files uploaded?
    No. Files are read and written by JavaScript and WebAssembly in your browser and never sent to PrintPal. The STEP and IGES reader is the only extra download, once, from a public CDN.