No, no, no… “Executive function failure.” If you have a family (specifically, one or more school-aged or younger children), you qualify for ADHD protections. This is from someone who has an actual diagnosis… 
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The G91 command is what’s preventing the Y move from working as expected when combined as @vicious1 suggests. When in “relative mode” G0 Y180 means “move Y positive 180 mm” so you can’t combine it with the “Move Z up 3 mm and retract the extruder 5 mm” because you don’t know how far to move to get to Y 180. Put a “G0 Y180” command after that last G90 (absolute mode) command and you should be good.
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Many thanks Tom, i tried your solution and it works very well.
This is my updated end-of-print setup in CURA:
M104 S0 ;extruder heater off
M140 S0 ;heated bed heater off
G91 ;relative positioning
G1 E-1 F300 ;retract the filament a bit before lifting the nozzle, to release some of the pressure
G1 Z+3 E-5 F900 ;move Z up a bit and retract filament even more
G90 ;absolute positioning
G0 Y180
M300 S300 P1000; warning signal
B.R. Paolo
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