I designed an articulated print cooling fan shroud and mount that uses a 40mm fan to direct a stream of air onto the part being printed, to aid in cooling the plastic. The shroud controls the air and directs it right around the tip of the hot end to reduce spill onto the bed and other parts of the print.

A print cooling fan helps to keep edges and especially overhangs crisp when printing PLA, helps keep the hot end from re-melting the part when it spends a lot of time over a small layer and even helps when bridging with ABS. With this shroud, I've been able to bridge up to 200mm with ABS:



The parts for the shroud and mount can be downloaded here: http://www.thingiverse.com/thing:351280

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