This is a prototype bearing. I wanted to make a bearing that works right off the build plate, and that wont open to allow the ball bearings to fall out. The small tabs were added to allow me to have lots of grip. I figured it would take a little torque to break the ball bearings free. I printed it but the tolerances were to tight. The balls stuck on the inside. I did get the bearing to spin but its not smooth due to a few broken balls. If its scaled up I think the gaps would grow and the balls may easily break free with out damage. See my other bearing, its better.I printed it using PLA. FF Creator Pro Nozzle temp 210 Plat temp. 65 Extrusion Fan: YES 6% fill No scale Time: Around 4 hours