Prusa i3 x-end

This is a version of the Prusa i3 x-end, both x-idler and x-motor end. The hole diameter of the x-idler is 4mm as opposed to the master distribution for 8mm bearings.

These parts are part of the box prusa i3 repo, but have been modified to be used on a single frame Prusa i3 to use 4mm bearings.