Prusa i3 MK3 Igus RJ4JP x-axis carriage

This is a re-worked x-carriage for the Prusa i3 MK3 to use Igus RJ4JP bearings. This includes STLs & scad files to create/change them as you see fit.

Using RJ4JP bearings on the x-axis helps reduce noise, but if you tighten the rear access panel too much the bearings deform making travel difficult. If you leave it looser, then the bearings slide back and forth due to oversized cutouts. These files solve that problem, as well as providing belt access even when the rear piece it attached.