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Sample 3MF Files — Download 3D Manufacturing Format for Testing

3MF — 3D Manufacturing Format · .3mf · MIME type model/3mf

2 files14 KB – 23 KBDirect linksNo ads, no sign-upFree for any useSHA-256 verified

Download a sample 3MF file to test a slicer or print-service integration. One file holds a single print-ready L-bracket (40 × 20 × 24 mm, 614 triangles) with a PNG package thumbnail; the other holds three separate objects — a cube, a sphere and a cylinder — each with its own display colour defined in a basematerials group.

3MF is the format the 3D Printing Consortium created to replace STL. It is a ZIP (an OPC package) containing [Content_Types].xml, _rels/.rels and an XML model at 3D/3dmodel.model, and unlike STL it records units, colours, multiple objects and build-plate placement explicitly. Both files are in millimetres, Z up, watertight and 2-manifold.

Rendered preview of the sample 3MF model
Static render of a sample on this page, flat-shaded by our generator. Open the downloads in any 3MF viewer to inspect them in 3D.

Download sample 3MF files

FileDetailsSizeDownload
sample-bracket-single-object.3mf
1 object • L-bracket 40 × 20 × 24 mm • 614 triangles • thumbnail • 14 KB
614 triangles · 303 vertices · 1 material · millimetres, Z up14 KB
14,052 bytes
Download 3MF
sample-multi-object-colors.3mf
3 objects, 3 colours (basematerials) • 2,248 triangles • 23 KB
2,248 triangles · 1,130 vertices · 3 objects · 3 materials · millimetres, Z up23 KB
22,754 bytes
Download 3MF
2 files · direct links · no sign-up · CORS enabled

Use these files from the command line or CI

Every URL is stable and CORS-open. Pin the SHA-256 in your test and you will know the moment a fixture changes.

# Download one file
curl -O https://pnb-freetoolsforweb.s3.us-east-2.amazonaws.com/samples/3d/3mf/sample-bracket-single-object.3mf

# Verify it (SHA-256 is listed for every file above)
shasum -a 256 sample-bracket-single-object.3mf

# Machine-readable index of every sample file
curl https://pnb-freetoolsforweb.s3.us-east-2.amazonaws.com/samples/index.json | jq '.files[] | select(.format=="3mf")'

3MF format at a glance

Full name3MF — 3D Manufacturing Format
Extensions.3mf
MIME typemodel/3mf
Specification3MF Core Specification (3D Manufacturing Format)
ContainerZIP / Open Packaging Conventions
Model part3D/3dmodel.model (XML, core namespace 2015/02)
UnitsDeclared in the file: unit="millimeter"
Colourbasematerials with displaycolor (sRGB + alpha)

What people test with sample 3MF files

  • Slicer and print-farm upload handling
  • Reading package thumbnails for previews
  • Multi-object and multi-colour imports
  • Unit handling (no more “is it mm or inches?”)
  • ZIP + XML parsing robustness
  • STL-to-3MF conversion checks
Testing notes. The bracket's thumbnail is referenced from the root _rels/.rels as a package thumbnail, as slicers write it. An old assimpjs (WebAssembly) build crashed on it while native Assimp 6.0 and three.js load it fine — a good example of why to test with a thumbnail present. Because 3MF is a ZIP, a generic MIME sniffer will report application/zip. Check for 3D/3dmodel.model inside before trusting the extension.

Frequently asked questions

Is 3MF better than STL?

For printing, yes. It is smaller (compressed), declares its units, supports colours, materials and multiple objects, and stores where each part sits on the build plate. STL is still more widely accepted by older tools, so most services take both.

How do I open a 3MF file?

PrusaSlicer, Bambu Studio, Cura and other slicers import it directly, and three.js has a 3MFLoader. Because it is a ZIP, you can also rename a copy to .zip and read the XML yourself.

What units and up axis do these files use?

glTF, GLB, OBJ, PLY, OFF, DAE and USDZ are Y-up in metres (the torus knot is about 1.4 m across). STL and 3MF are Z-up in millimetres and rest on z = 0, as slicers expect. FBX is Y-up in centimetres. The units and up axis of each file are listed in its details, so you can check that your importer scales and rotates correctly.

Where do these models come from?

We generate them. A script builds the geometry from formulas (a torus knot, UV spheres, cubes, and a bracket made with a boolean modelling library), then writes each file format byte by byte from its specification. Nothing is downloaded, scanned or converted from someone else's model, which is why they are free for any use, including commercial, with no attribution.

Are these 3MF files safe to download?

Yes. Every file is generated by our own open script from scratch — nothing is scraped or user-uploaded — and contains no scripts, macros or executables. The SHA-256 of each file is published on this page so you can verify what you received.

Can I use the sample 3MF files commercially?

Yes. They are free for any purpose, including commercial products, test suites, demos and redistribution, with no attribution required. There is nothing to license and no one to ask.

Can I hotlink these files or use them in CI?

Yes. Every link is a stable direct URL over HTTPS with Access-Control-Allow-Origin: * and long cache headers, so curl, wget, fetch() and test runners can pull them directly. A JSON index of every file is linked from each page (see the command-line section).

Related sample files

Sample STL filesSample OBJ filesSample ZIP filesSTLOBJglTFGLBPLYUSDZDAEOFFAll 3D models →

Free tools that work with 3MF

  • Unit Converter — Convert between every common unit — metric and imperial, cooking, data, pressure, energy, speed, fuel economy — instantly, in your browser.
  • Hash Generator — Hash text or files with MD5, SHA-1, SHA-256, SHA-384, SHA-512 and CRC32, verify a checksum, or compute an HMAC. Files never leave your device.

Found a problem, or something that could be better? We read every message and we fix things quickly.

Testing a file pipeline? We build them.

Uploads, conversions, previews, document processing and media workflows are the kind of production systems FreeToolsForWeb designs and runs for clients — which is why we needed these files in the first place.

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