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; Lift Z relative to current position
G91
G1 Z10 F6000 S2
G90

M913 X50 Y50						; reduce motor current to 50% to prevent belts slipping
G91							; use relative positioning

; X
G1 S1 X-500 F4000					; move the X to max until it detects the min Point
G92 X0							; set X min Point
G1 S1 X30						; move X away from min Point

M400

; Y
G1 S1 Y-500 F4000					; move the X to max until it detects the min Point
G92 Y0							; set X min Point
G1 S1 Y30						; move X away from min Point

G90							; back to absolute positioning
M913 X100 Y100 Z100					; motor currents back to normal

; Z
G1 S1 X168 Y95 F2000 					; put head over the centre of the bed, or wherever you want to probe
G30            			    			; lower head, stop when probe triggered and set Z to trigger height

G91                					; relative mode
G1 Z10 F6000 S2       					; raise head 4mm to ensure it is above the Z probe trigger height
G90                					; back to absolute mode