I am building a Laser Engraver. I have Uno and CNC Shiel v3. I have NC Optical switches. I configured $5=1 $21=1 $22=1 In config.h I have: #define HOMING_CYCLE_0 ((1<<X_AXIS)|(1<<Y_AXIS)) My switches for X and Y work when tested. UGCS Platform shows ALARM:Z Will not perform HOMING Any help appreciated.