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Reduce an STL for MakerWorld

MakerWorld limits each print profile to 150 MB and the raw model files of a design to 250 MB in total; some accounts see the 200 MB profile limit introduced in 2024. A single dense STL can use the whole budget. This page opens the reducer at 140 MB so one file leaves room for the rest of the profile.

📉
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: MakerWorld

File size cap
150 MB
Triangle cap
no fixed cap
Triangles at that size
3.15 million

This page opens the reducer at 140 MB. Source: Bambu Lab forum, MakerWorld upload limits (checked 2026-09).

Why the file is over it

Print profiles bundle the model with plate layout and settings, so the STL is not the only thing counted. Models that come from a scan, a sculpt or Bambu Studio's mesh boolean can carry 3 to 6 million triangles; at 50 bytes each that is 150 to 300 MB before anything else is added. The forum threads on this limit are mostly people with exactly that kind of file.

How to get under it

  1. 1Drop the STL below. The target is preset to 140 MB; lower it if the profile has several plates.
  2. 2Press Reduce. Flat areas lose triangles first, so the printed surface changes far less than the number suggests.
  3. 3Read the result card. It shows the new size and whether the mesh is still watertight.
  4. 4Download, place it in Bambu Studio, and upload the profile.
Reduce for MakerWorld (target 140 MB)

What to expect

A 220 MB scan (about 4.6 million triangles) reduced to 140 MB keeps 2.9 million: at the resolution of a 0.4 mm nozzle the difference is not printable. Going to 60 MB still leaves 1.25 million triangles and uploads faster; most figures and busts look identical at that level.

Other ways

Bambu Studio has Simplify Model in the right-click menu, which works but gives no size target and can make curved surfaces look faceted at aggressive settings. Splitting the design across several profiles avoids the per-profile cap but not the 250 MB raw model total.

Questions

Is the limit 150 or 200 MB?

Bambu raised the per-profile limit to 200 MB in March 2024; older guidance and some regions still show 150 MB. Aim under 150 MB and you are safe either way.

Does the 250 MB total include the 3MF?

It counts the raw model files attached to the design. The 3MF you export from Bambu Studio contains the meshes, so a lighter STL makes the 3MF lighter too.

Will reducing change how supports generate?

Only where the surface actually changes. Overhang angles are preserved because decimation merges triangles along the existing surface rather than smoothing it.