Early Play adopters, if you have had trouble with the wiring from the extruder carriage "hanging up" on the corner of the print bed as it travels on the Y axis, try this quick fix.
Remove the M3 6mm screw at the end of the wire relief arm on the extruder carriage. Loosen the other M3 6mm screw holding the delrin wire relief. Simply thread the first M3 6mm screw back into the carriage, and rest the delrin wire relief on top of the socket cap of the M3 6mm screw. This adjustment will direct the extruder wiring further away from the print bed, preventing hang-ups without reducing Z axis travel.