HE3D-XI3 3D printer Repetier software config help!
Based on some troubleshooting in the question comments, it appears that the issue here is the motors running the wrong way. This can be fixed EITHER by inverting the motor directions in firmware, OR by simply flipping the orientation of the motor plugs where they connect to the controller board. Flipping the plugs is an easy and quick way to reverse the phase of a stepper and thus reverse its direction of motion.