¶ 1. First check the extruder problem, make sure the extruder screws are not loose, and tighten the screws.
¶ 2. Check whether the cooling fan on the hot end is working properly. If the cooling fan is not working, it is a blockage caused by insufficient heat dissipation and the fan needs to be replaced.
¶ 3. Clean the nozzle, heat the nozzle to 220°C, and use a silver needle to clear the nozzle. Try adding materials manually to see if any filament is extruded from the nozzle.
¶ 4. Check the material tube, pull out the material tube at the hot end, check whether the end of the polymer tube is blocked or melted, use scissors to cut off about 0.5-1CM, re-insert the material tube, make sure it is inserted all the way, and then Try to extrude.
¶ 5. Heat the hot end and take it out (be careful of burns). Check whether there are any blocked consumables in the pipe. Clean it before use. If it cannot be cleaned, replace it with a new pipe or hot end.