Prusa i3 x-end-motor by Radus - Remix

Based on Prusa i3 x-end x-carriage by Radus: http://www.thingiverse.com/thing:101914

1) I added an adjuster for calibrate the z endstop on a prusa i3. Simply insert an M3 nut.
2) Also I modified the height of the slot to insert the M5 nut, for a better printing.