I have a problem with my steppers of a RepRap 3D printer I'm making.
I assembled the machine and performed the endswitch calibrations. when the machine is not printing, the steppers are moving as expected. But, when I start printing, only the z-axis moves. it is also moving very fast; X and Y axis don't move. I'm using a RAMPS 1.4 board, NEMA 17 steppers and A4988 stepper drivers. My configuration file can be found here.
Does somebody know what could be the problem?