Barrel cooling duct for MendelMax 2 & JD Dually Belt Driven Extruder

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I designed this to fight the noted heat creep problem. I also wanted to prevent intake and exhaust turbulence from warping the part, thin profiles are particularly susceptible.This is designed around the J-Head hot ends, it could work with other hot ends that have a 16mm diameter barrel.I intended this for use with ABS and other materials where cooling the part would be unwanted. For PLA, you need another fan to cool the part after it is laid down.