unload filament – ender3 w/bondtech extruder
G21 ;metric values
G90 ;absolute positioning
M109 S215.000 ;Heat hotend to 215C for PLA
G92 E0 ;Reset the position of the extruder
G1 E-400 F2000 ;Retract 400 mm of filament at 2000 mm/minute speed
G92 E0 ;Reset the position of the extruder
M400; Wait for commad to finish
M117 REMOVE FILAMENT NOW ;Display message
M400; Wait for command to finish