• A guide pulley for a slow-speed flat belt.
  There are two versions, one with a 608 bearing hole, and the other with a 6201 bearing.

608 version size: 36x60mm
Size of the 6201 version: 42x60mm

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• The pulley for the SPZ/Z-type belt with a diameter of 67mm.
  There are 6201 bearing holes on the pulley, but unfortunately, it can't be used with a tapered sleeve. Of course, this pulley can also be used as a pulley for ropes. I suggest significantly increasing the wall thickness due to wear and tear.
• I suggest that in both cases, you increase the wall thickness in the slicing software, increase the infill rate by 80%, and then polish it with a fine sandpaper after printing.