I would take the idler wheel off and pull the filament out. Check to see if it's all chewed up. It probably is, so use a Q-tip and clean out the hobbed bolt grooves and the rest of the space where the bearing sits. Clean your idler bearing also.
Before you reassemble, turn on your hot end and wait until its at temp. Clip off the damaged filament and insert into the hot end. You should be able to push the filament through and make plastic springs on your build plate.
When you put the idler back on the fresh piece of plastic, make sure you give it some pretty good torque. I tighten mine to the springs are a fraction of being fully compressed.
Oh and the other thing that messed me up when I began was the my extruder was way off on the calibration. When I tried to feed X mm, the motor tried to extrude enough for 10X mm. It was too fast. The filament jammed then stripped. After you get chewed up plastic it stops feeding.
