vertical axis wind turbine 3d

Create a single 3D printable vertical axis wind turbine rotor body. Geometry is a vertical hollow cylinder height250mm outer diameter250mm wall thickness3.5mm. Central axial shaft bore cylindrical diameter22mm concentric full height flat top and bottom. At Z=0 integrate a mounting flange outer diameter160mm thickness10mm with 4 through holes diameter8.5mm equally spaced on 140mm pitch circle add 3mm fillet between flange and cylinder. Inside cylinder model two helical Savonius buckets each spanning about180deg around shaft bucket thickness3.5mm inner radius40mm outer radius120mm apply helical twist45deg over 250mm height round leading edges with 2mm fillet. Also inside add two vertical Darrieus blades straight full height NACA0015 airfoil chord45mm max thickness6.75mm blade pitch radius95mm neutral pitch. Connect each blade to shaft region using two radial support arms at Z50mm and Z200mm arm length75mm thickness5–6mm rounded profile with 5mm fillet at blade roots.