Sample STL File — Download a 3D Model Test File (ASCII STL)
Stereolithography 3D model (ASCII) · .stl · MIME type model/stl
Download a sample STL file — a small pine-tree model built from stacked cones and a cylindrical trunk, in human-readable ASCII STL. It opens in Cura, PrusaSlicer, Blender, Windows 3D Viewer, macOS Preview and web viewers such as three.js.
STL is the format of 3D printing and the most common 3D upload. A small, watertight ASCII file like this is ideal for testing viewers, thumbnail generators and print-service upload flows before moving to large binary STLs.
Download sample STL files
| File | Details | Size | Download |
|---|---|---|---|
sample-model-tree.stl | — | 51 KB |
Need one of every data format? Download the data sample pack (202 KB, one small file of every data format (17 files)).
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-website-bucket.s3.us-east-2.amazonaws.com/samples/data/stl/sample-model-tree.stl # Verify it (SHA-256 is listed for every file above) shasum -a 256 sample-model-tree.stl # Machine-readable index of every sample file curl https://pnb-website-bucket.s3.us-east-2.amazonaws.com/samples/index.json | jq '.files[] | select(.format=="stl")'
STL format at a glance
| Full name | Stereolithography 3D model (ASCII) |
|---|---|
| Extensions | .stl |
| MIME type | model/stl |
| Encoding | ASCII (text) STL |
| Geometry | Triangulated cones + cylinder, watertight |
| Units | Unitless (interpret as mm) |
What people test with sample STL files
- 3D viewer and thumbnail generation
- 3D-print service uploads
- STL → OBJ/GLB conversion
Frequently asked questions
ASCII or binary STL?
Binary STL is far more common in practice because it is about 5× smaller for the same mesh. ASCII is easier to inspect and test with. Ours is ASCII; parsers should detect the type from the first bytes ('solid ' for ASCII), not the extension.
Are these STL 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 STL 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
Testing a file pipeline? We build them.
Uploads, conversions, previews, document processing and media workflows are the kind of production systems Pine & Birch designs and runs for clients — which is why we needed these files in the first place.
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