Fan Duct for the 'original' 50mm Ultimaker fan, with donut-shaped cooling area around the nozzle.
This is a derivative of Geo Hagen's well designed Fan Duct (www.thingiverse.com/thing:16624) and Owen's great Fan Duct (www.thingiverse.com/thing:13625)
Printed in PLA, no support or raft needed.
20120219 Added a lower resolution STL file with less polygons.
Just print it aligned flat on the fan mounting flange. No support or raft needed. Prints well in PLA, does not melt.
Best to rework the holes with 3.2mm drill (just by hand) to make sure the screws fit nicely.