Prusa I3 Rework FAN-DUCT Upgrade with Solidworks 2014 Source

**Version 2 is now available http://www.thingiverse.com/thing:543371 that has a lot more air flow**
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An upgrade to the dismal fan duct that is part of the original I3 Rework package. This one allows way more air to circulate around, and through, the hot end than the original (it had a bad blockage AND a ton of air would hit the part/bed as well as blow back out, instead of blowing on the hot end, due to it).
I have added a version for lower profile hot ends including its source file.
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