This VAWT uses a design, developed by K.A.Ugrinsky in 1946. It is basically a Miller rotor with integrated Lenz 2 features.

The diameter of the disc is 205 mm. The active rotor diameter is 200 mm.
The rotor shape is taken from Ugrinsky's sketch (see screenshot in files), using dimension R=100.

You can either print the bottom part only once and use the cover, or you can alternatively print the bottom several times and stack them (twisted by 90 degrees), using the cover only on the uppermost part. I am using 2 bottoms and the thing spins nicely in my garden at pretty low winds. If you print both, this one and also the C-Rotor in my other design, you can directly benchmark the two designs.

I glued all parts together with semi liquid cyan acrylate glue.

It is designed for use with 608 ball bearings ( 8mm rod, 22 mm outer diameter, 7 mm high). I am only using 2 bearings and do not install one in the middle to prevent mechanical stress. The bearing covers are protecting the bearings a bit from rain.

UPDATE 2023/04:

There is an article in a scientific magazine from 2020, that suggests, that some different dimensions give a better maximum power coefficient. The efficiency seems to be 17% and so 54,5% better than a Savonius.

I did not update the model yet but I wanted to add the information for other makers or designers of remixes. Therefore I added another picture with their proposed dimensions of S=0,35D and L=1,3R and I also added a 2D CAD, I quickly made to check the real proportions and looks.

The researchers uses numerical simulations to optimize the wing dimensions.
If you are interested int he article, look for this:

Sakamoto, L.; Fukui, T.; Morinishi, K. Blade Dimension Optimization and Performance Analysis of the 2-D Ugrinsky Wind Turbine. Energies 2022, 15, 2478. https://doi.org/10.3390/en15072478

My own comparison to C-Rotor:
I have the C-Rotor and the Ugrinsky running in my garden since a while now. I did not make measurements and I did not test them under a load. However, comparing them as free running rotors over a longer time in many different wind situations, the Ugrinsky provides significantly better performance. It starts spinning at lower wind speeds and produces higher RPM.