Fan extension for "Printrbot Simple, 300mm Y Axis-No Sag!"

This fan extension is for http://www.thingiverse.com/thing:242185

The Y extension is very good but as the extruder is very hot, with time it can **bend the support**.

This fan allows to cool the support, avoiding bending or further distorsion.

This extensions for the **Printrbot simple after 23/10/2013**.