R1+ Fix for 3D ROBO R1 Dual Fan Mount

After printing out the 3D ROBO R1 Dual Fan Mount upgrade (http://www.thingiverse.com/thing:821080) made by [TechSupportGo](http://www.thingiverse.com/TechSupportGo/about) the rear fan would not fit due to the shape of the hot end.

I threw the fan shroud into 123D and shortened it so it wouldn't touch the hot end anymore.

After the upgrade my prints are coming out amazing!