Wanhao D5s Fan duct for ultimaker hotend mod

This is a fan duct designed for the D5s and modified from http://www.thingiverse.com/thing:1499118.

I have replaced the stock D5s hotend with Ultimaker hotend nozzle, peek, isolator etc. The um hotend is shorter than the stock one. I have shortened the duct to fit the shorter ultimaker hotend. I also thickened the area around the rear bolt hole to improve grip.