Every thing was going fine until i started duel extruding. Then I got both jammed 4 times over a weekend and the prints where crap. I found the stock fans are not up to the task. The stepper motors would be to hot to touch and the plastic would start melting up the tube and even into the extruder. This cased jams from the motor down.
I bought 2 fans with 12cfm and m3x50mm bolts attached them and now my stepper motors just get warm to the touch and I can print duel just fine. I also put some heatsink grease between the heatsink and bar
