About this 3D model

Bearing with an external diameter of 10cm and internal diameter of 8.4cm. Needs 25 4.5 metal BBs. I used theses ones : http://amzn.eu/d/7PGQWlH . Also needs 6 m2 nuts/bolts Originaly made as to be used for antweight battle bots. More variations of this design are including a click in version and a parametric design.