@Anawandur said in I need help setting up duplication on an IDEX printer:
; Axis Limits
M208 X10 Y-3 Z0 U35 S1 ; set axis minima
M208 X335 Y255 Z240 U355 S0 ; set axis maxima
As @NeoDue says, using duplicate and mirror mode is much easier if you set your m208 limits so that XD0 Y0 is the centre of the bed. This also saved you from having to change the bed settings in the slicer depending on whether you are using duplicate/mirror mode or not.