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3MF file format (.3mf)

3MF (3D Manufacturing Format)

What is a 3MF file?

3MF is the modern replacement for STL, backed by the 3MF Consortium (Microsoft, HP, Autodesk, Prusa and others). It stores watertight meshes together with units, colors, materials and print settings in one ZIP-based file, and current slicers increasingly prefer it over STL.

  • Real units, colors and materials — none of STL’s ambiguity
  • Backed by major slicer and printer vendors
  • Compact ZIP container, always watertight by spec

Best for: Modern 3D-printing workflows that need more than bare triangles.

View 3MF files online

Open .3mf files in the free online 3MF viewer — assembly tree, section views and display modes, entirely in your browser.

How to open a 3MF file

  1. Open the online 3MF viewer. It runs in your browser, so there is no software to install and no account to create.
  2. Drop your .3mf file in. The file is parsed locally and never uploaded. Inspect it with the assembly tree, section views and display modes.
  3. Convert it if you need another format. Press Convert to turn 3MF into STL, then download the result straight from your browser.

Convert 3MF to other formats

3MF to STL3MF to OBJ3MF to PLY3MF to GLB3MF to glTF3MF to OFF3MF to USDZ

Convert other formats to 3MF

STEP to 3MFIGES to 3MFBREP to 3MFSTL to 3MFOBJ to 3MFPLY to 3MFGLB to 3MFglTF to 3MFCOLLADA to 3MFAMF to 3MFFBX to 3MF3DS to 3MFOFF to 3MFLAS to 3MFPCD to 3MFXYZ to 3MFPTS to 3MF

Frequently asked questions

How do I open a .3mf file?

Drop it into the free online 3MF viewer on this site — it renders in your browser with an assembly tree and section views, and the file is never uploaded. No software install needed.

Does 3MF store units and colors?

Units: yes, required by spec. Colors/materials: colors & materials. Geometry is stored as watertight triangle mesh.

How do I convert 3MF to STL?

Use the free 3MF to STL converter: drop the file, press Convert, download. Everything runs locally in your browser — no upload, no signup.

What is 3MF best used for?

Modern 3D-printing workflows that need more than bare triangles.

Can 3MF restore editable CAD geometry?

No. 3MF improves on STL with declared units, parts, colors and materials, but its shape is still a triangle mesh. Exact curves, constraints and feature history are already gone.

Can 3MF store animation?

No. 3MF is used for modern 3d printing, and its format does not carry animation tracks.