SampleTestFiles

100 KB STL sample file

An STL file of exactly 102,400 bytes. It is a valid STL 3D model (stereolithography) file, generated for this site and checked with an independent parser. Use it wherever you need a 100 KB sample, test or dummy STL file.

Download

sample-stl-100kb.stl

100 KB102,400 bytes

Download 100 KB STL

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Type
model/stl
SHA-256
eacf9476778fd19208cd1ac2b2c5391e4f09ee0e705e8d7a880b1751af06dc72
Direct URL
https://www.sampletestfiles.com/downloads/stl/sample-stl-100kb.stl

What is in this file

One solid of 572 triangles forming a height-field surface, each written as a facet with its normal and three vertices. Blank lines before the closing endsolid statement, which ASCII STL ignores, bring the file to the exact size.

Triangles572
EncodingASCII STL
Solids1 (terrain)
UnitsNone: STL has no unit of measurement
Colour and materialsNone

How the file begins

The opening lines of sample-stl-100kb.stl, exactly as they appear in the file.

solid terrain
  facet normal -0.1467 0.6125 -0.7767
    outer loop
      vertex 0.0000 0.0000 0.0000
      vertex 0.0000 0.6341 0.5000
      vertex 0.5000 0.1197 0.0000
    endloop
  endfacet
  facet normal -0.1197 0.6298 -0.7675
    outer loop
      vertex 0.5000 0.1197 0.0000
      vertex 0.0000 0.6341 0.5000
      vertex 0.5000 0.7291 0.5000
    endloop

Preview

Shows the first 64 KB of the file.

Where 100 KB matters

A 102,400-byte file that sits exactly on the default request-body limit of Express. These are the default limits a file of this size is useful for testing:

SystemLimitNote
Express body parsers100 KB (102,400 bytes) by defaultA request body of exactly this size passes; anything larger returns 413 Payload Too Large.
Gmail message clippingAbout 102 KB of HTMLLonger messages are truncated behind a "view entire message" link.
Amazon DynamoDB items400 KB per item100 KB fits; the 500 KB sample does not.

All 100 KB sample files

Use this file for

  • Checking email size handling
  • Checking detection of ASCII and binary files
  • Verifying volume, surface-area and bounding-box calculations

Testing notes for STL

  • The .stl extension is also used for Windows certificate trust lists, which is why some servers label a 3D model application/vnd.ms-pki.stl.
  • A binary file may start with the word "solid" in its free-text header, and many do. Detection has to test whether the file length equals 84 plus 50 bytes for each triangle, not just read the first five bytes.

STL format reference

Technical details

File namesample-stl-100kb.stl
FormatSTL (STL 3D model (stereolithography))
Extension.stl
MIME typemodel/stl
Size102,400 bytes (100 KB)
KindText
Signature73 6F 6C 69 64
SHA-256eacf9476778fd19208cd1ac2b2c5391e4f09ee0e705e8d7a880b1751af06dc72
Created2026-10-10
ValidationExact size, signature bytes and structure checked when the file was generated
PreviewAvailable on this page
SourceGenerated for this site; not copied from elsewhere
LicenceFree to use, modify and redistribute (terms)
Category3D Models

Validated for expected format and integrity. As with any download, scan the file with your own security tools before opening it. How files are made and checked

Download from the command line and verify

Fetch the file with curl, then compare its checksum with the SHA-256 value above.

curl -o sample-stl-100kb.stl 'https://www.sampletestfiles.com/downloads/stl/sample-stl-100kb.stl'
sha256sum sample-stl-100kb.stl     # Linux
shasum -a 256 sample-stl-100kb.stl # macOS

On Windows, run Get-FileHash sample-stl-100kb.stl -Algorithm SHA256 in PowerShell. A matching value proves that the download is complete and unaltered.

Related files

Other STL sizes

Other 100 KB files

Use cases

Guides

Questions about this file

Is this file exactly 100 KB?
Yes. It is 102,400 bytes, which is 100 KB in the binary units that operating systems and server limits use (1 KB = 1,024 bytes).
What is inside the 100 KB STL file?
One solid of 572 triangles forming a height-field surface, each written as a facet with its normal and three vertices. Blank lines before the closing endsolid statement, which ASCII STL ignores, bring the file to the exact size.
Can the sample model be 3D printed?
The sized samples are an open, terrain-like surface with no thickness, intended for testing importers and viewers. The binary cube is a closed, watertight solid that a slicer will accept.