I've created this end effector and im pretty sure it will work, but i'm still waiting on parts to test it out. It uses four 30x30x10mm fans. One cools the hot end and the other three blow air on the print. I use "uxcell® M3x4mmx5mm Female Threaded Brass Knurled Insert Embedded Nuts" on amazon for the hot end clamp. For the arm nuts, use the stock internally threaded tubes that the printer already uses. To mount fans, I use #2 size 5/8" long screws. I meant to order and use #4 size screws but oh well.

Feedback would be greatly appreciated as this is still in development!

9/22/16 update
I mounted all of the components, got all the wiring soldered to a connector, and got the bed manually leveled. The part cooling fans cool the heater block down too fast and too much. So much so that it trips the thermal shut off and stops printing. I could adjust the firmware to allow for a larger deviation in temperature, or I can design fan ducts to direct the air at the part.

9/24/16 update
finished the part cooling fan ducts. I made some custom supports for the duct because slicers have a hard time detecting the sharp edged overhang. part files updated.

10/22/16 update
even with the fan ducts, the high air flow rate is still cooling off the heater block too fast. ive been hard at work designing new end effectors.

I am currently on version 5, which ive uploaded under a new part page. http://www.thingiverse.com/thing:1844149