Up Date to my Dual Extuder and Fans

As with my earlier one this one only uses one Fan with plenty of air flow. I used this one
http://www.amazon.com/gp/product/B00EL938E6?psc=1&redirect=true&ref_=oh_aui_detailpage_o02_s00 Five of them for around $11.00
and it's a 5 volt fan but you can run it at 12 volts with no problems. This way you get a good bit of air flow. I have been using this for a little over 7 mounts now and had no problems. I do recommend using a variable voltage regulator so that you can set it to your need on