Downward Blower Duct for Replicator 2

I have found when printing PLA, on some parts where even cooling is critical, the stock blower duct on the Replicator 2 is uneven. Favouring right to left movement, rather than left to right on the X axis. So I set about designing a new blower duct that directs air directly downwards for more even cooling. This design has gone through several iterations, but the latest one appears to do the trick.

As proof of concept I printed an [enhanced version](http://solidoodletips.wordpress.com/2012/12/