Modified duct for lightweight blower

This is just an amalgam of many great ideas, none of which are mine. I needed something a little more direct than sndlover's design (http://www.thingiverse.com/thing:1336355) with the finesse of thruit00's design (http://www.thingiverse.com/thing:537918), so I came up with this monstrosity. YMMV.
Three versions. The original is a remix of a remix of thruit00's design for only one extruder. The second is the same, but reversed for a better view of the extruder tip. The third includes both s