Hackaday recently posted about DIY air bearings here and here. Lots of good stuff in there, from lapping the graphite in to discussions of the stiffness of the bearings around the 3 minute mark in the next video. Air bearings are nice because they give all of the benefits of hyrdrodynamic bearings without the oil mess, and they’re self cleaning because they push contamination out of the beaing.
I also found this nice explainer of types of air bearings at Specialty Components, and this nice breakdown of design considerations for air bearings at IBS Precision Engineering.
Paul Carson Designs 