Makerfarm E3D v5 Cooling Fan Duct

This is a cooling duct for the Makerfarm Prusa i# for a E3D v5 hotend.
After installing the E3D I starting getting the same warping issues that I was getting with the magma hotend and ABS until in installed [papergeek's duct](http://www.thingiverse.com/thing:161066).
I found [MikeP-NZ's duct](http://www.thingiverse.com/thing:222873) and added the extra duct out the back.
I printed in 2 halves then used [this method to weld](http://www.thingiverse.com/thing:23606) them together
I used a h