RoBo3D Dual Fan Holder for Hexagon Hot Ends

This is a replacement mount for any Robo3d printer with a hexagon hot end. Adds a secondary mount for a 40mm fan.

edit 4/16/15: It was brought to my attention that the original did not fit on the latest revision of robo's with the X endstop on the carriage. This should fix that issue

also added a route for running your heater wires, etc

It should also be reversible to put the 25mm fan under the gear side