Roller with 623zz bearing support
thingiverse
Roller that includes a hole for a 623ZZ bearing: my printer needed a .310mm larger hole to get the bearing to fit snugly. You might have to adjust the hole to get yours to fit properly. The roller is 14mm at its narrowest point and 19mm at its widest point. This has yet to be tested, but it should make the wheel run much smoother. You may need to use supports with a 3-degree angle; my trial prints broke off the build plate without support.
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