If the nozzle is at the middle air,not hit any limit switch,all four switch show open.
It show:
x_min open
y_min open
z_min open
(5)
m302----manual control extruder motor
Before manual control extruder motor ,need heat nozzle to targeted temperature and can melt
filament.this step is to prevent the extruder run at cold status, then input 302.
Important note:if use M302 code, must guarantee the nozzle temp reaach 175
℃。
If can not reach 175
℃，
the extruder can not run. !!!
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