When your hot end is jammed, you might notice less filament coming out of the nozzle or no filament at all! Here are a few of the more common causes:
Heat Creep,Hot end temperature is too low,Nozzle too close to bed, Inconsistent Filament Diameter, Dust or particles.
Steps to Unclog your Nozzle :
1.Heat the nozzle to printing temperature and manually feed about 10cm of filament through the hot end (where the bowden tube was).
2.Once you have some filament coming out of the nozzle, bring the nozzle temperature down (120C for ABS, 90C for PLA, and 100-140 for Nylon).
3.Pull on the top of the filament until you feel it start to slowly give out. If it comes out too easily and there is no residue on the end, lower the temperature. If you have trouble pulling it out, raise the temperature until it does.