The bearings are composed of three interlocking rings that can slide past each other to reduce friction. 

Printable bearings are great for prototyping because they are lightweight and easy to work with.

Quick tips for successful print:

• Use 3Dlac, glue stick, or liquid glue for better adhesion.
• or clean the bed with isopropyl

• If you are experiencing difficulty with bearing rotation, don't worry, it should loosen up and become much smoother over time, or add some lube.

These dimensions:

6700: 10 x 15 x 4 mm
6000: 10 x 26 x 8 mm
6200: 10 x 30 x 9 mm
6001: 12 x 28 x 8 mm
6201: 12 x 32 x 10 mm
6702: 15 x 21 x 4 mm
6002: 15 x 32 x 9 mm
6202: 15 x 35 x 11 mm
6203: 17 x 40 x 12 mm
6704: 20 x 27 x 4 mm
6004: 20 x 42 x 12 mm

NEW:

608: 8x 22 x 7 mm
6204: 20 x 47 x 14 mm

625zz: 5 x 16 x 5 mm