Like many other people, I had a lot of trouble with the extruder motor overheating. Mine got hot enough to soften the extruder block and the motor screws pulled through. There are many ways to solve this problem, but I built a fan shroud to mount a 40mm fan to keep the motor cool.

The shroud is designed to keep stray air from blowing on the bed, which I found caused problems with print adhesion. With this shroud, the motor peaks at around 45C, even with the current set as recommended by the MakerFarm instructions.

The parts can be downloaded here: http://www.thingiverse.com/thing:343026

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