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Brilliant design, thanks for sharing, i really want to make one and use it to charge an electric bicycle. Do you think it is possible to print a stator? I guess you would have to purchase curved magnets, and other complications...
Now for some power greedy questions. How much taller do you think you could scale this using an m20 axle? I'm thinking about using a 50mm dia steel tube as the axle (£10 per meter). This should be stiffer to allow it to scale upwards, the sky's the limit right. It would also be able to mount directly to the end of a 50mm scaffold tube with an off the shelf coupler. Mount this to the side of a house, and have a lanky version of your turbine!
How much power are you generating? average windspeed at your testing location?