Small wind turbine MK2 windmill

new mk3 version is here:
https://www.thingiverse.com/thing:6363659

This is upgraded version MK2 of Small wind turbine. But it is just model aprox. 500 mm length, it does not produce any electric or mechanical energy.
I made some changes regarding better covering bearings from rain water, and some changes to remove massive support needed for print first version. Now only support is needed for blade itself, because it is printed in horizontal position. That is why also mechanical properties of the blade is far better now.
Blade and all parts with M8 thread printed in 0,15 mm layer and propeller_hub with M4 thread printed in 0,1 mm. Other parts printed in 0,2 mm.
I added also spiral groove at front propeller_hub, I think it looks better now ...
Other material for finish assembly is the same:
4x ball bearing 618, 628, d=8 mm, D= 16 mm W=5 mm
3x screw M4x20 mm
7x nuts M8 but narrow DIN439
1x steel thread rod M8 cut L=432 mm. (rest to 1 m is used as vertical pole)

Material I