I would have to look it up.

looked up from my prime/wipe startup gcode (which is basically Clough42's prime/wipe code):


G90 ; absolute positioning
G92 E0 ; reset extrude
G1 E12 F200; extrude 12mm at 200mm/min
G1 E9 F200; retract 3mm at 200mm/min

when I change filament I heat it up, pull the idler over to free the grip on the filament and pull it out by hand. you don't want to retract hot filament all the way back to your extruder or bowden tube.