Prusa i3 MK3 X End Idler to fix belt rubbing and twisting

Modified X End Idler plastic part for the Prusa i3 MK3 to fix the common problem of the X belt twisting and rubbing. The original part (both initial and improved R2 marked version) provides too little support for the belt roller axle screw which, as a consequence, is getting pulled askew by belt tension.

This part completely fixed the problem on my printer.

The original part can be found here:
https://github.com/prusa3d/Original-Prusa-i3/blob/MK3/Printed-Parts/scad/x-end-idler.scad
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