OBJ to 3MF converter
Convert OBJ to 3MF free online for modern 3D printing with color, materials, and multi-part support. Works with Cura, PrusaSlicer, and Bambu Studio.
Drop a file to convert here
or click to browse
About 3D Manufacturing Format
Common Use Cases
- Upgrading OBJ models to the modern 3D printing standard
- Preparing models with color for multi-material printers
- Using 3MF features like build plates and print settings
3MF (3D Manufacturing Format) is the modern replacement for STL, designed by the 3MF Consortium (Microsoft, HP, Autodesk, and others) to fix the limitations of legacy 3D printing formats. Unlike OBJ, which was designed for 3D rendering, 3MF is purpose-built for manufacturing with support for color, materials, multi-part assemblies, and embedded print metadata.
OBJ is a rendering-oriented format with materials and UV coordinates. 3MF is a manufacturing-oriented format that stores mesh geometry with color, materials, print settings, and build plate layout in a single ZIP-based package.
Why Convert OBJ to 3MF?
Modern 3D print format
3MF is the successor to STL, supported by Cura, PrusaSlicer, Bambu Studio, and Windows 3D Builder. It fixes STL limitations like missing units and non-manifold handling.
Color and material support
3MF can store per-triangle color and material assignments, enabling full-color printing on multi-material and color printers.
Multi-part assemblies in one file
3MF supports multiple mesh objects with individual transforms and materials in a single file, unlike STL which merges everything.
Compact ZIP-based package
3MF files are ZIP archives with compressed XML, producing files significantly smaller than equivalent STL or OBJ files.
When to use each
Use OBJ when...
- Editing in Blender, Maya, or 3D renderers
- UV textures and rendering materials
- Universal 3D interchange
- Human-readable text format
- Legacy tool compatibility
Use 3MF when...
- 3D printing with modern slicers
- Multi-color and multi-material printing
- Embedded print settings and build plates
- Compact ZIP-based packaging
- Next-generation manufacturing workflows
Common use cases
- Upgrading OBJ models to the modern 3D printing standard
- Preparing models with color for multi-material printers
- Using 3MF features like build plates and print settings
How to use
- Upload your OBJ file. Drag and drop a .obj file onto the upload area, or click to browse. Files up to 500 MB are supported.
- Start the conversion. Click Convert File. OBJ geometry and materials are converted to the 3MF manufacturing format.
- Download your 3MF. Save the .3mf file and open it in Cura, PrusaSlicer, Bambu Studio, or any 3MF-compatible slicer. Files are deleted from our servers within 1 hour.
Frequently asked questions
- What is 3MF?
- 3MF (3D Manufacturing Format) is a modern 3D print format created by the 3MF Consortium. It supports color, materials, multi-part models, and print settings in a compact ZIP package.
- Are OBJ materials converted?
- Basic material properties from .mtl files are mapped to 3MF material definitions. Complex rendering materials may be simplified.
- Which slicers support 3MF?
- Cura, PrusaSlicer, Bambu Studio, Simplify3D, Windows 3D Builder, and many other modern slicers support 3MF natively.
- Is 3MF better than STL?
- Yes for 3D printing. 3MF supports color, materials, units, multi-part assemblies, and print metadata that STL cannot represent.
- Are multiple objects preserved?
- Yes. Named object groups from the OBJ file are preserved as separate mesh components in the 3MF package.
- Is converting OBJ to 3MF free?
- Yes. Free with no signup. Anonymous users get a daily allowance, registered accounts get higher limits, and Premium or Lifetime members get unlimited conversions.
- What is the file size limit?
- The maximum file size is 500 MB per conversion.