In the last few days my k1max has been failing, when starting the third layer of the print the nozzle gets clogged, I have already changed the nozzle, the head plate, the motor and I still have the same problem, when removing the nozzle I see that it has a piece of filament that does not melt despite being inside the nozzle which is at 230 degrees, I have even tried to raise the temperature to 250 degrees and still the piece of filament does not melt, I can’t think of what to do and I can’t print anything