When I'm auto-leveling my Anet A8 with Marlin firmware, the nozzle heats to 195°C during the leveling process, which leaves drops of filament. I checked the resulting G-code but makes no sense to me:
M107 M190 S55 ; set bed temperature and wait for it to be reached M117 Homing Axes G28 ; Home axis M117 Autoleveling G29 M117 Cleaning Nozzle ; Indicate nozzle clean in progress on LCD M109 S200 ; Uncomment to set your own temp run warmer to clean out nozzle M107 ; Turn layer fan off G21 ; Set to metric change to G20 if you want Imperial G90 ; Force coordinates to be absolute relative to the origin G0 X10 Y0 Z0.15 F9000 ; Move in 1mm from edge and up z 0.15mm G92 E0 ; Set extruder to 0 zero G1 Y190 E50 F500 ; Extrude 100mm filiment along Y axis 190mm long to prime and clean the nozzle G92 E0 ; Reset extruder to 0 zero end of cleaning run G1 E-3 F500 ; Retract filiment by 3 mm to reduce string effect G1 X3 Y190 Z15 F9000 ; Move over and rise to safe Z height G1 X3 Y0 Z15 F9000 ; Move back to front of bed at safe Z height to shear strings
My printer heats the bed, then homes axes while setting the nozzle temperature to 195°C.
Then autolevels and finally
M109 S200 does its job.
How can I prevent the nozzle from heating when there is no G-code for it (except the