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Hi Bojun
I would guess you have tried this, but, does the filament move freely through the tube when the tube is not connected?
Also, is the thermistor correct? If that is reading a higher than actual temperature, then it would be harder for the filament to go through the hot end.
Does the filament move through readily with no nozzle? Hot or cold?
Hopefully it doesn't take too long to solve.
Good luck
Philip
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