So my problem is although the hotend itself isn't jamming inside, but the filament gets jammed up entering the hotend. Not sure what the problem is there, but one thing I notice is the heatsink is kind of hot (55C in 30C ambient), and am not sure the fan is working correctly. A lot of reviews I read about the v5 mentioned a loud 30mm fan, but the fan I got is silent, and doesn't blow very much. Does this sound like I got a bum fan? Any ideas on the filament entry jam? I am using ABS with default .4 nozzle, on a Prusa i3.