I managed to get a video of a print failing on my 3D printer. I marked the plastic so you could see that it was not extruding. The first layer printed no problem, the second layer maybe it 5-10 times back and forth in the corner before jamming. Pardon the messy build plate, I did print on a cleaner side of the plate. The gear is turning, trying to push the plastic down, but the plastic has been stopped extruding. If I stop the print, and try manually extruding it usually gets going again, but will often jam up shortly after starting another print.