wind turbine

This is a wind turbine with a kind of large air intake. It receives a larger air amount without increasing the force required to rotate the turbine. I don't own a 3d printer so i'm not sure my design is printable. If you think it is not you can modify the file and make it possible. ;)

ps: There is a little piece that need to be fixed to the axis of rotation when the wind turbine will be assembled.
(I'm sorry if I made mistakes but english is not my mother tongue)