Ultimaker fan support New Version

This is an easy fan support for ultimaker (print it with ABS ! no pla).
It makes your possible to choose another material for the arms.

This is my pattern : http://www.thingiverse.com/thing:35365
Thanks to ultimakerinleipzig.

This is compatible with my heated bed that need at leat 4 mm over the bed.

New : I correct the air flow and i chanfreined the flat screw's holes.