belt winder

My dad asked me to model something like this, and after printing it turned out great, but becuase a part of the filament was moist the top surface turned out bad.You need 2 bearings(printed or not printed, both should work well)Outer diameter: 31,950mmInner diameter: 12mmHeight: 10mmYou can also add square magnets13mmx13mmx2.5mm but i reccomend adding a little bit smaller magnets.