This is a replacement for the windbarrier on the UP! extruder, it redirects a portion of the cooling air down over the part as it is printed allowing the layers to cool faster for more easier support removal (ABS) and less slump (PLA) when going supportless.
I got the original file from, http://3dprintingsystems.com/support/
I remodeled it in SolidWorks 2010.
print, cut longer vertical notch in main extruder mount part for fan cable add at least 2 m3 x 16 SHCS (I use 4) to mount fan, press into heatsink and enjoy.