You can see where to put these scripts within Cura on the Starting & Ending G-code Scripts Location page.
G90 ; set to absolute positioning - this line was added in case Cura doesn't include it by default M82 ; set extruder to absolute mode - this line was added in case Cura doesn't include it by default (may not be needed) G28 ; home all axes ; The lines below are to prep the nozzle before a print begins G1 Z0.2 F1200 ; raise nozzle 0.2mm G92 E0 ; reset extrusion distance G1 Y10 ; move Y-Axis (bed) 10mm to prep for purge G1 X100 E12 F600 ; move X-carriage 100mm while purging 12mm of filament G92 E0 ; reset extrusion distance
M104 S0 ; turn off hotend/extruder heater M140 S0 ; turn off bed heater G91 ; set to relative positioning G1 E-2 F300 ; retract the filament a bit before lifting the nozzle to release some of the pressure G1 Z1 ; raise Z 1mm from current position G1 E-2 F300 ; retract filament even more G90 ; set to absolute positioning G1 X20 ; move X axis close to tower but hopefully far enough to keep the fan from rattling G1 Y120 ; move bed forward for easier part removal M84 ; disable motors G4 S360 ; keep fan running for 360 seconds to cool hotend and allow the fan to be turned off - adjust to your needs M107 ; turn off fan. Don't use M106 S1. Some say M107 doesn't work for them but if the hotend is below 70 degrees it should work
G90 ; set to absolute positioning - this line was added in case Cura doesn't include it by default M82 ; set extruder to absolute mode - this line was added in case Cura doesn't include it by default (may not be needed) G28 ; home all axes G92 E0 ; reset extrusion distance
M104 S0 ; turn off hotend/extruder heater M140 S0 ; turn off bed heater G91 ; set to relative positioning G1 E-2 F300 ; retract the filament a bit before lifting the nozzle to release some of the pressure G1 Z1 ; raise Z 1mm from current position G1 E-2 F300 ; retract filament even more G90 ; set to absolute positioning G1 X20 ; move X axis close to tower but hopefully far enough to keep the fan from rattling G1 Y120 ; move bed forward for easier part removal M84 ; disable motors
G1 Z0.2 F1200 ; raise nozzle 0.2mm G92 E0 ; reset extrusion distance G1 Y10 ; move Y-Axis (bed) 10mm to prep for purge G1 X100 E12 F600 ; move X-carriage 100mm while purging 12mm of filament G92 E0 ; reset extrusion distance
Add this just before the line with M84 ; disable motors
G90 ; set to absolute positioning G1 X20 ; move X axis close to tower but hopefully far enough to keep the fan from rattling G1 Y120 ; move bed forward for easier part removal
Add this just before the line with M84 ; disable motors
G90 ; set to absolute positioning G1 Z121; move gantry all the way up
Nozzle temperature must be below 70°C before command M107 is received else the fan will remain on.
If the fan remains on after a print is completed try increasing G4 S360 to G4 S420. This will wait 420 seconds (7 minutes) before sending command M107.
G4 S360 ; keep fan running for 360 seconds to cool hotend and allow the fan to be turned off - adjust to your needs M107 ; turn off fan