About this 3D model

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.