What we tested

FileBambu Studio saidActual problemResult
40 × 20 × 12 mm block saved in metersThe object from file … is too small, and may be in meters or inches. …Clean solid at 1/1000 scaleYes: 40 × 20 × 12 mm
Same fileThe object from file … is too small, and may be in meters or inches. …Clean solid at 1/1000 scaleNo: 0.04 × 0.02 × 0.012 mm; slicing failed
Bambu Studio 02.08.02.61 on macOS, in the app (2026-10-27), and from the command line for slicing. Nothing was printed.

What is going on

STL files carry no unit. Blender writes meters by default, so a 40 mm part becomes 0.04 in the file. FixSTL checks the mesh, not the units; it showed the block as a clean solid 0.04 × 0.02 × 0.012 across.

What was actually wrong

How to fix it

  1. Click Yes, then check the size in the object panel.
  2. Fix the export so the next file is right: in Blender, set the export Scale to 1000 or model in a millimetre scene.
  3. If the size is still wrong, scale by 25.4 for inches or 1000 for meters.

Source: Seen in our tests · Bambu Studio 02.08.02.61 on macOS