Improved fan duct for my E3D/J-Head direct drive extruder

Here is a better fan duct for this extruder: http://www.thingiverse.com/thing:147705

With the original (and very simple) fan duct I noted that the print quality on the opposite side of the fan was not as good as under the fan. The idea of this one is to distribute the airflow around and behind the nozzle.