This designs allows you to place a dual 40mm filament cooler fan integrated with the E3D own 30mm hot end cooling fan.
Mounting is easy, just screw a small plate over your 30mm fan like as shown in the render picture.
Bigger pipes for bigger blow.
Added version with 40 heatsink fan
Added version with shroud
You can print it with Supports or not. It's easy to clean them out.
A long time I was using e3d volcano on prusa i3 with http://www.thingiverse.com/thing:1519726 but then I switched to a smaller V6. I needed something similar. So I created fan duct inspired by this creation. Just added second fan and changed tubes.