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I'm currently building something similar and I'm have having problems with my 425oz motors only goin one direction. I'm using ramps 1.4 with M542T drivers and repetier 92.9 with arduino 1.8.1. I've tried disabling ends tops and I've wiring the driver a few different ways with no luck. Any help would be great.
Arduino Controlled CNC / 3D Printer Hybrid