Prusa i3 Rework - Cooling fans

The fan duct binding is similar to the original binding from the prusa i3 rework (EMotion Tech).
You can download this fan duct here :
http://www.thingiverse.com/thing:119616/#files

In my case, I used 2 fan duct from Emotion tech (40mm fan), and I designed two others to cool down the print (50mm fan).
With this model, you can choose if you want to use 1, 2 or 3 fan duct to cool your print / cool your extruder.

This cooling configuration is perfect to print complex geometries, bridges, large angles...