This easy turn table uses a 608 bearing and half of an upcycled Prusament spool (or any spool with a 51 mm inner diameter ). There is a shroud around the bearing that has a small airgap between the base. This is so that if you decide to paint your cinderblock collection, it will not crush the bearing and will still rotate freely. 

608 bearing for reference:

• Bore diameter(d) 8 mm
• Outside diameter(D) 22 mm
• Width(B) 7 mm

Printing tips:

• 0.4 ≥ nozzle
• 0.3 ≥ layer height
• 10% infill