Micromake blower-fan-duct and effector

EDIT APR-3-16: I added a revision of the duct because I felt that the flow of mk1 was not good enough and also because I sometimes print ABS with no fan but that made my duct melt :) the new model has better flow and should be printed with support.

I had originally designed a duct for a 40mm fan but discovered that my PLA prints were looking nice only on one side because the other wasn't being cooled effectively. I had a blower fan in the draw that I purchased from aurarum.com, which had a 1