WONDERFUL! Other problems can be:
1) If the hotend temperature is too high for the capacity of the heatsink, the filament will increase its diameter near the hotend and get stuck in the PTFE tube.
Symptoms: click of the extruder motor, noozzle clean, the filament is stuck inside the PTFE tube because it has widened (it is better to disassemble the extruder and remove the filament from there, so that the enlarged part of the filament makes a shorter path to go out and does not risk breaking inside)
2) Coil rolled up badly
Symptoms: extruder motor clicks, clean noozzle, worn filament where the extruder knurled wheel is (I think, this has never happened to me)
3) If the wheels of the extruder carriage are worn out because they are too narrow, the carriage will no longer move in a linear but sinosoid way. The noozzle will therefore be too close to the plate in some places and too far in others. To solve the problem, the wheels must be replaced.