Dual Fan Ducts

Update 12/14:
I have added larger opening slip on ducts now. Details in Instructions.

This is a dual 30mm x 10mm fan system for use on a Solidoodle printer with Lawsy's carriage.

You can find his files here : http://www.thingiverse.com/thing:104059

I printed these with support on in slic3r at 0.1mm.

Constructive criticisms, comments, and questions are welcome.