G1 E10 F600 		; Feed 10mm of filament at 600mm/min
G1 E600 F3000 		; Feed 600mm of filament at 3000mm/min
G1 E10 F300 		; Feed 10mm of filament at 300mm/min
G4 P1000 			; Wait one second
G1 E-5 F1800 		; Retract 5mm of filament at 1800mm/min
M400