• Guide pulley for slow speed flat belts.
  There are two versions one with a 608 bearing bore and the other version is with a 6201 bearing.

Version 608 dimensions : 36x60mm
Version 6201 dimensions : 42x60mm

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• Pulley for belt type SPZ/Z with diameter 67mm. 
  There are holes for 6201 bearings on the pulley, unfortunately it cannot be fitted with taper bush. The pulley can of course also be used as a pulley for the rope. I recommend to increase the wall thickness significantly due to abrasion. 
• I recommend in both cases to increase the wall width in the slicer , add 80% infill and then sand with fine paper after printing.