G2S Universal Effector 40mm Extruder Fan Mount

Here is the 40mm fan mount for cooling extruders on my G2S Universal Effector (spider). [http://www.thingiverse.com/thing:1356159] The only suitable space for a fan this size is nestled inside the spider, blowing directly onto the sides of the extruders, which actually works quite well.

Definitely use this if you are running dual J-heads, should also work well with the MK8s.