Adjustable linear bearing for Anet A6

Adjustable linear bearing for the Anet A6 X-carriage (maybe others). Each one is using three small ball bearing and the tension between the ball bearings and rail rod is adjustable via set screws. This can remove all noticeable play between the rail rods and x-carriage and still be able to move the carriage with almost no friction. I can't really emphasize enough the stability and smooth movement improvements this makes for the carriage.

I plan to expand this technique to all the other A6/A8 linear bearing as well, so stay tuned.