Mendel90 Hot End 30mm Fan Duct
thingiverse
I upgraded my J-Head mk4 hot end's cooling by designing this duct to add a 30mm fan to the Mendel90. This part slips inside Wingmaster's square fan duct (http://www.thingiverse.com/thing:657540) and fits snugly under the X-carriage. Simply attach with four #2 screws and glue in place, then install a fan. I've also created a version with two fans for extra cooling power, but I haven't tested it personally since one seems sufficient. It may interfere with homing in the x-direction - if you try it, please let me know how it goes.
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