gear shift knob 3d model

Create a detailed 3D model of a car gear shift knob inspired by MazdaSpeed style. The knob has a smooth ergonomic teardrop / bulb shape with a slightly flattened top. On the top surface, engrave a stylized “MS” logo (MazdaSpeed style), recessed into the surface (not raised), with clean sharp edges and uniform depth. The knob should have a matte plastic finish, slightly textured for grip. The bottom part includes a cylindrical mounting section with an internal threaded hole. IMPORTANT: The internal thread must be M8 x 1.25 (metric thread), accurately centered and properly sized for real-world use. Proportions: • Total height ~90–110 mm • Maximum diameter ~50–60 mm • Smooth transition between top and base The model should be solid, manifold, and suitable for 3D printing (no holes except the threaded insert). Optimize geometry for FDM printing (no extreme overhangs, clean topology). Center the object at origin. Export-ready high-quality mesh.