Boosted Fan adaptor

I found that the 40 mm fan wasn’t enough to cool my prints properly. Si I added a cage fan to it.
Its very effective. So much I need to lower the fan setting (around 70%) for high temp materials (nylon 240C) because the heater can't keep up
I kept the original 40mm fan on, but it would also work without.

Fits with
http://www.thingiverse.com/thing:1533928
http://www.thingiverse.com/thing:351280