Davinci 80mm fan exhaust

Mounts into the hole on the side of the davinci printer, and mates to a 80mm fan.
Part2 mates the other side of the 80mm fan to the flex duct.
Sorry it's rotated funny. This was the first part I designed!
Uses a 4" duct like this: http://smile.amazon.com/FO450-5-ply-Supurr-Flex-Aluminum-Ducting/dp/B00009W3H2
I used hose clamps like these: http://smile.amazon.com/Spectre-9704-Hose-Clamps-Pair/dp/B004AJ352W