HICTOP Prusa i3 Fan Blower

This is a remix of http://www.thingiverse.com/thing:1228237 and I have (rather shabbily) added extra room for better air flow and increased printability. The old version was somewhat of a pain to print because of the large unsupported middle section. Also, the back middle air hole on the old design forced out too much air, so I reduced the air flow to that area by putting a support column in the interior.