Prusa i3 Fan Duct for J-Head & Wade - Improved

This is still just a quick variation of philsson's 40 mm fan duct. http://www.thingiverse.com/thing:184055
This time I increased the size of the duct a bit, so there should now be a little bit more air flowing to the extruded material.
I've also tried to control the flow of air around the nozzle a bit better. I had printed a few big herringbone gears for a Wade style extruder and they came out distorted. Turns out that most of the air flow that is directed at the extruded plastic was coming