When I wanted to take out the filament from the extruder, it didn't wanna come out, it was stuck (even when I heated up the nozzle). So I unscrewed the nozzle and it looks like the filament is all pressed together at the top of the nozzle. What does this mean? I am heaving issues extruding filament from the nozzle, the filament barely comes out and the extruder motor is clicking. Can someone help, please.