当我使用 Marlin 固件自动调平我的 Anet A8 时，在调平过程中喷嘴加热到 195°C，这会留下细丝滴。我检查了生成的 G 代码，但对我来说没有意义：

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

我的打印机加热床，然后在将喷嘴温度设置为 195°C 的同时返回轴。

然后自动调平，最后M109 S200完成它的工作。

如果没有 G 代码（除了M109 S200），如何防止喷嘴加热？