Widemouth Fan Duct for Rostock Max Part Cooling

This is a fan duct for Rostock Max that directs but doesn't overly restrict airflow from a 30mm fan. I went a little crazy making iterations to arrive at this design, using each one to print the next. This is the last one, and it works the best.

Update 2/18/15 - The UNTESTED version has a radius to prevent dragging on the bottom edge... I found it hit my print bed's binder clips sometimes when doing big prints.... I'll be printing one shortly to replace the one I've trimmed down, so probabl