Modified RepRapPro Fisher Delta Carriage

Modified carriage design from the source. This new version uses captive locking nuts inside the part as well as on the outside in addition there are 2x M3 threaded rods, 20mm long, that are screwed into the part through the nuts. You can see from the picture how the hardware is assembled into the part. Adjustment is made using the threaded rod and the outside locknut, for more detail please see http://www.thingiverse.com/thing:1034390. The improvement in this modification comes by having the loc