3D printing is tricky beast, and there are many potential reasons why your extruder is having problems. The first thing to do, is to make sure that you know what material you’re using, and that you have the proper temperature settings.
Each material has an ideal range of temperatures
ABS: 220 -240°C
SOFT PLA/BENDLAY: 220-235°C
GLOW IN THE DARK PLA: 185-205°C