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Reduce an STL for i.materialise

i.materialise's upload limit is 100 MB per file. That is generous, about 2.1 million triangles of binary STL, but full-resolution scans and multi-part sculpts pass it easily. The reducer opens here at 90 MB so the upload does not fail at the margin.

📉
Drop an STL file here or click to browse
Up to 300 MB · .stl only
Choose STL file
1
Upload STL
2
Set target MB
3
Download
MB
1 MB500 MB

We aim for exactly this size. Quality-preserving quadric decimation stops as soon as the file fits. If the mesh cannot be reduced further without breaking, we return the smallest safe result.

Pick an STL file to continue.
🔒 Files are processed on our server in isolated memory and removed within 15 minutes of your download.

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The limit: i.materialise

File size cap
100 MB
Triangle cap
no fixed cap
Triangles at that size
2.1 million

This page opens the reducer at 90 MB. Source: i.materialise help, Maximum file size (checked 2026-09).

Why the file is over it

Models sent to i.materialise are often the ones people want in resin, multicolour or metal, and the files behind them come straight from ZBrush, a 3D scanner or an AI generator at native resolution. Nothing in that pipeline caps the count; a bust scan at 0.05 mm point spacing is 5 million triangles before cleanup.

How to get under it

  1. 1Drop the STL below. The target is preset to 90 MB.
  2. 2Press Reduce. For most models 90 MB leaves well over 1.5 million triangles, more than any of their materials can resolve.
  3. 3Check the result card for watertightness; i.materialise runs its own repair, but a clean input avoids surprises in the quote.
  4. 4Download and upload.
Reduce for i.materialise (target 90 MB)

What to expect

A 260 MB scan (5.4 million triangles) to 90 MB keeps 1.9 million. On a 150 mm bust that is one triangle per 0.1 mm of surface, finer than the layer height of every material they offer. Reducing to 45 MB is usually invisible too and halves the upload time.

Other ways

i.materialise's uploader auto-repairs but does not simplify. Their help article points to Meshmixer, which is discontinued; MeshLab and Blender remain the desktop options, both needing a percentage-and-retry loop to land under 100 MB.

Questions

Does the 100 MB apply to STL only?

It applies to every accepted format. STL is the largest per triangle after ASCII formats, so it is the one that most often needs reducing; 3MF and OBJ of the same mesh are smaller.

Will a reduced file price differently?

No. Pricing is by volume, bounding box and material; the mesh detail is not a factor.

Can I reduce a multi-part model?

The tool handles one STL at a time. Export the parts separately and reduce each with the same target; the shells do not need to be merged for upload.