I purchased an arduino and a 3 axis stepper motor(tb6560) after finding 3 stepper motors from cd roms. I hook them up the way the grbl wiki page says, and downloaded the universal gcode sender. I ran the gcode sender, and can move the stepper motors using the directional buttons. It works best with the step size set to .02. Whenever i upload gcode though the stepper motors will only move one click before stopping, even if it goes way past that. Any ideas? Is it the example gcode i used, or the controller/ stepper motors.