40mm Fan Mount for Cooling Printrbot Simple Filament Entrance

I was having issues with my PLA melting early and buckling inside of the extruder during long prints. After looking at many other solutions for inspiration, this is what I came up with. It seems to work quite well, although I'm considering opening up the top of the extruder a little bit for additional airflow.

I replaced the four extruder motor screws with M3x40mm screws. I also used a 12VDC 40mm fan from Radio Shack and 6x3/4 sheet metal screws to attach the fan to the mount. This mount