Hi, I am not sure this is a mach3 problem or not. My machine as now started to play up on the z axis. During a cut it starts to add steps. If I start the cut at zero on the face of the material, during the cut the z axis will add steps. If I stop the cut and return to zero, the machine will go back fine on the x,y axis, but z will drop 20mm. I have checked the motor connection to the bull screw and that’s ok. The cutter is not moving from the spindle. I am using a car-labs smooth stepper. Anyone have any ideas. Thanks, michael