shaft coupler 3d model

Create a 3D printable shaft coupler (STL) for a NEMA 17 motor: total length 35 mm, main body 18 mm diameter. One side must have a 5.1 mm diameter hole, 15 mm deep, with a D-shaft flat and an M3 lateral set screw hole. The opposite side must be a solid 8 mm diameter shaft, 15 mm long. Include a smooth fillet between sections and ensure proper tolerances (0.1 mm) and manifold geometry.