@shinmai I have had this trouble with my CR-10, filament not printing. I have replaced the tube, both connectors AND the nozzle, yet nothing but a single small blob exits the nozzle. I thought after the nozzle replacement I had it fixed, since I could see a string of melted filament stream out when I manually pushed the filament. Now I can't even get that. I see the gears move for the filament motor, so all seems to be working. What else is there to fix/replace??