Replicator 1 Adjustable Fan Duct

This is an adaptation of [Replicator Ducted Fans Clip-on to (a) cool Print](http://www.thingiverse.com/thing:40524) and [PLA Replicator Ducted Fan Clips Modded](http://www.thingiverse.com/thing:191297) to incorporate an idea from [40mm Fan Duct - Replicator 2X](http://www.thingiverse.com/thing:107080) This is for a Makerbot Replicator 1.

The basic idea is to use the print head cooling fan as a print cooler as well. By using some ducting and reversing the orientation of the print head cooling