bmw sedan 3d model

A highly detailed 3D model of a BMW 520i sedan, optimized for 3D printing. Requirements: - Solid body (no hollow parts) - All windows and glass parts must be fully solid (no transparency, no thin shells) - No interior details (no seats, dashboard, steering wheel) - Exterior only, simplified but clean geometry - Thickened small parts to ensure printability (mirrors, pillars, edges) - Closed manifold mesh, watertight model - No floating or separated parts - Smooth but not overly complex surfaces Design style: - Realistic proportions of BMW 520i - Minimal fine details to avoid print failure - Slightly simplified car features for FDM printing 3D printing constraints: - Optimized for FDM printing (Bambu Lab A1) - Minimum wall thickness >= 1.2mm - Avoid overhangs greater than 60 degrees - Flat bottom for stable printing - Single-piece model Output: - STL format - Centered and properly scaled model