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Reduce an STL for Shapeways

Shapeways refuses files over 64 MB or one million polygons. Because one million triangles is about 48 MB of binary STL, the polygon cap is the one you will hit. The reducer opens here at 48 MB, which keeps the count under the limit for any binary STL.

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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
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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: Shapeways

File size cap
64 MB
Triangle cap
1,000,000
Triangles at that size
1.34 million

This page opens the reducer at 48 MB. Source: Shapeways support, How to reduce file size (checked 2026-09).

Why the file is over it

Shapeways prints in materials like nylon and steel where designers push resolution up to get crisp detail, and jewellery models from ZBrush or Blender's sculpt mode routinely export at 2 to 8 million triangles. Their own help article recommends decimation as the fix, and that is exactly what this tool does, with a size target instead of a percentage slider.

How to get under it

  1. 1Drop the STL below. The target is preset to 48 MB, which is one million triangles or fewer.
  2. 2Press Reduce. Fine sculpted detail is kept where the surface actually curves; flat and gently curved areas give up their triangles.
  3. 3Check the watertight indicator on the result card; Shapeways also requires a closed mesh.
  4. 4Download and upload to Shapeways.
Reduce for Shapeways (target 48 MB)

What to expect

A 200 MB jewellery sculpt (4.2 million triangles) to 48 MB keeps 1 million: at Shapeways' finest detail resolution of about 0.1 mm the visible difference on a 30 mm ring is nil. If your model is small, consider 24 MB; the printer cannot use the extra triangles anyway.

Other ways

Shapeways' article walks through Blender's Decimate and MeshLab's Quadric Edge Collapse. Both work; both need a percentage guess and a retry loop to land under a byte limit, which is the part this page removes.

Questions

My file is 40 MB and still rejected. Why?

Probably ASCII STL, which is about five times larger per triangle than binary. The reducer always writes binary, so even a file that needs no decimation comes out smaller.

Does the wall thickness check change after reducing?

No. Decimation moves no vertex further than the collapse tolerance, a fraction of a layer; thin walls that passed before pass after.

Can I go far below the limit?

Yes, and for most prints you should: the print resolution, not the triangle count, decides the detail you get.