spur gear 3d model

Generate a 3D model of a standard spur gear based on the following exact specifications: - Pitch Diameter: Calculate based on outer diameter and tooth depth. - Outer Diameter: 105 mm - Root Diameter: [AI should calculate: Outer Diameter - (2 * Tooth Depth) = 102 mm] - Number of Teeth: [AI should calculate from pitch: ~329 teeth (approximated from 105mm * π / 1mm)] - Tooth Depth: 1.5 mm - Bore Diameter: 6 mm - Face Width: 5 mm - Pressure Angle: 20 degrees (standard) Model must be a manufacturable, manifold solid with a smooth involute tooth profile. Ensure the model is dimensionally accurate and ready for CNC machining or 3D printing. Output as an OBJ file with clean topology.