I checked on my print and found the printer was printing in mid-air with nothing coming out of the hotend. Upon further inspection I found the hobbed gear all clogged up with ABS fragments and it was just slipping on the filament instead of driving it down through the hotend. I initially was worried that reversing the heatsink fan had caused problems but I was able to manually extrude by pushing down on the filament.






Here is a pic of the filament. Do the marks show too much or not enough tightness on the hobbed gear/idler? Or maybe this is caused by something else...