M83                                    ; relative extruder mode
M291 P"Hotend is heating up..." S1 T0  ; display message
G10 S200                               ; turn hotend heater on
M116                                   ; wait for the temperatures to be reached

M300 S200 P500                         ; beep
G4 S1
M300 S200 P500
G4 S1
M300 S200 P500

M292                                   ; hide message
M291 P"Filament ready to unload?" S3   ; ask the user
G1 E-30 F300                           ; retract slow
G1 E-1250 F2000                        ; retract fast
M400                                   ; wait for moves to complete

M300 S200 P500                         ; beep
G4 S1
M300 S200 P500
G4 S1
M300 S200 P500

M291 P"Disable hotend heater?" S3      ; ask the user
G10 S0                                 ; turn hotend heater off
M18 E0                                 ; disable extruder stepper