Matt - nice, we've just done the same thing, but have updated the github yet...
Dario - the x motor is on slots, so you undo the 2 bolts on the x motor, do the belt up tight (in the x carriage), then pull the motor back, and do up the bolts. Last point here: [
www.reprappro.com]
Do you need more adjustment than this?
Ian
RepRapPro tech support