Cup Turner Bearing
thingiverse
Cup Turner Bearing uses 4.5mm (4.37mm avg) Steel BB's and the inner diameter is used with 1" PVC pipe. I Used Crosman Copperhead Steel BB's and PVC pipe from Lowe's. This has tight tolerances so make sure your printer is calibrated properly. The inner race is .1 mm over 4.38mm with a .5mm gap between the inner and outer race. The Outer Bearing and Base has a 0.00mm tolerance - Intended to be flush press fit. I suggest using a small amount of super glue around the outer edge of the top outer race to secure it in place permanently.
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