3MF Converter

How to Convert 3MF to Any Format

1. Add Your 3MF File: Click "Choose 3D file" and pick the .3mf you exported from your slicer or CAD app. The conversion runs entirely in your browser — the model is parsed and rewritten on your own machine.
2. Pick an Output Format: Use the "To format" dropdown to choose your target mesh — STL, OBJ, GLTF, GLB, or PLY. STL is the safe pick for slicers and printers; OBJ and PLY suit modeling apps; GLTF/GLB are built for web and real-time 3D.
3. Check the 3D Preview: The model loads in the preview area so you can confirm it parsed correctly before you commit — handy for catching a flipped or empty mesh.
4. Convert and Download: Click the download button to save the converted file (for example "Download .stl"). No sign-up and no watermark, and everything happens locally.

Popular 3MF Conversions

• 3MF to STL — the universal mesh for slicers and printers that don't read 3MF (drops color and materials)
• 3MF to OBJ — for editing in Blender, Maya, Cinema 4D and most modeling apps
• 3MF to GLB — a single self-contained file for web viewers and AR
• 3MF to GLTF — the open standard for real-time 3D and game engines
• 3MF to PLY — for point-cloud and scanning pipelines that expect per-vertex data

Why Convert a 3MF File?

3MF (3D Manufacturing Format) is an open 3D-printing format published by the 3MF Consortium, which Microsoft and a group of hardware partners launched in May 2015; the first core specification appeared on 29 April 2015. Under the hood a .3mf is not a single XML file but an Open Packaging Conventions (OPC) container — effectively a ZIP archive — that bundles the model geometry alongside color, materials, multiple objects, units, and print metadata in one package. The format is now recognized as an international standard (ISO/IEC DIS 25422). It was designed to fix the limitations of STL, which stores only raw triangle geometry with no color, no units, and no material data.

That richness is exactly why you sometimes need to convert away from it. Common reasons:

• A slicer or printer only accepts STL. Older versions of Cura and many budget or legacy slicers never added 3MF import. Converting 3MF to STL hands them a plain triangle mesh they understand — at the cost of the color and material data 3MF was carrying.
• You want to edit the model, not print it. Blender, Maya, Cinema 4D, and similar tools speak OBJ fluently. Converting 3MF to OBJ gets your geometry into a modeling pipeline cleanly.
• You're putting the model on the web or in AR. GLTF and its binary form GLB were built by the Khronos Group for real-time 3D, web viewers, and game engines. Converting 3MF to GLB produces a single self-contained file a <model-viewer> element can load directly.
• A scanning or research pipeline expects PLY. PLY stores per-vertex data (positions, colors, normals) and is common in 3D-scanning and point-cloud workflows.

Because xconvert's 3D converter runs client-side, the conversion is a good fit for proprietary or unreleased designs — the mesh is read and rewritten in your browser tab and never travels to a server.

3D Mesh Format Comparison

What Carries Over from a 3MF

The rule of thumb: the mesh always survives, and everything 3MF added on top of STL survives only where the target format has somewhere to put it. That is why the original .3mf is worth keeping as your master file even after you export.

Frequently Asked Questions

What is a 3MF file and what opens it?

A 3MF (3D Manufacturing Format) file is an open, ZIP-based package for 3D-printing models that holds geometry plus color, materials, multiple objects, units, and print metadata in one container. It opens in modern slicers like PrusaSlicer, Bambu Studio, OrcaSlicer, and recent Cura, in Microsoft 3D Builder and Paint 3D, and in most current CAD and modeling apps. If a tool can't read 3MF, converting it to STL or OBJ gives that tool a mesh it does understand.

Should I use 3MF or STL for 3D printing?

If your slicer supports 3MF, keep the model as 3MF: it preserves color, per-object material assignments, units, and print settings that STL throws away, and it's smaller because it's compressed. Use STL when you need maximum compatibility — sharing a model on a site that expects STL, or feeding a printer or older slicer that never added 3MF import. The mesh geometry is identical either way; the difference is the metadata 3MF carries and STL cannot.

Will I lose color or material data converting 3MF to STL?

Yes. STL stores only raw triangle geometry — it has no concept of color, materials, units, or separate objects. Converting 3MF to STL flattens everything to a single uncolored mesh. That's fine for monochrome FDM printing, but if your 3MF defines multiple colors or materials and you want to keep them, convert to a format that supports them, such as GLB or OBJ (with its companion material file), instead of STL.

Does the 3MF conversion run in my browser or upload my file?

It runs entirely in your browser. The 3D converter parses and rewrites the mesh locally using JavaScript — no server processing and nothing stored on our end. That makes it a safe choice for proprietary or unreleased designs. The practical limit is your browser's memory, so extremely dense meshes are the main reason a conversion would struggle rather than upload size.

Which format should I convert 3MF to for use in Blender?

Convert 3MF to OBJ. Blender imports OBJ natively and reliably, and OBJ keeps your geometry and UVs intact for editing, sculpting, or re-texturing. If you specifically need PBR materials and textures bundled into one file for a game engine or web viewer, convert to GLB instead — Blender also imports glTF/GLB, and it round-trips materials better than OBJ does.

How big can the 3MF file be?

In our testing, single-object 3MF models from desktop slicers (typically a few hundred KB to a few MB) convert in a second or two in-browser. Because the work happens on your own machine rather than a server, the ceiling is your browser tab's available memory rather than an upload cap — very large multi-million-triangle scan meshes are the main case where a desktop tool like MeshLab or Blender will be more comfortable than a browser converter.

Why did my supports, plate layout, and print profile disappear?

Because none of those were ever part of the model. PrusaSlicer, Bambu Studio, and OrcaSlicer save a project by writing extra, vendor-specific parts inside the 3MF's ZIP package alongside the standard geometry — modifier meshes, painted supports, seam and color painting, per-object print settings, and the arrangement of objects on the build plate all live in those private parts rather than in the shared 3dmodel.model geometry. STL, OBJ, GLB, and PLY are pure mesh formats with nowhere to put any of it, so the conversion keeps the shape and drops the project. Treat the original .3mf as your project master and the converted mesh as a one-way export for a tool that can't read 3MF.

Can I open a .3mf and look inside it?

Yes, and it is the quickest way to tell a real model package from a slicer project. A .3mf is an Open Packaging Conventions container, which is a ZIP archive with a prescribed internal layout. Copy the file, rename the copy to .zip, and extract it: you will find [Content_Types].xml, a _rels/.rels relationships file, and 3D/3dmodel.model — the XML that actually holds the vertices, triangles, materials, and build items. Many packages also carry a thumbnail image under Metadata/, and slicer project files add their own folders next to the standard ones. Reading 3dmodel.model in a text editor is also a fast way to check the declared unit attribute before you export to a format that has no units at all.