40mm Fan Servo Controlled Flap (half duct)

View an animation of this at: http://0ze.ro/fan_flap_animation.gif

This is a servo controllable fan duct flap for 40mm fans that will open and close half of the duct using a hobby servo. It is great for split duct objects that may need half blocked or turned off for whatever reason. This piece will work great with:
http://www.thingiverse.com/thing:839620
or
http://www.thingiverse.com/thing:1344418