I recently had a jammed Maker Select Plus. I disassembled it and cleared up the jam then noticed that it wasn't actually pulling filament through the hot end. Upon further inspection, I found that the extruder gear was not turning with the shaft of the motor, so I tightened the set screw and fixed the issue. On the first print after that, it printed normally at first, but then the set screw issue happened again. I am not sure what to do. I have read that Monoprice started putting better extruder gears into their machines when shipping and I only just got mine at the end of November 2017. I am not sure if I am doing something wrong, or if this is a common problem. Please help!