bmw sedan 3d model

BMW 520i sedan, simplified exterior shell, no interior, no wheels, no separate parts, single solid object, windows fully solid and filled, no transparent or hollow areas, fully watertight mesh, manifold geometry, clean topology optimized for FDM 3D printing, support-free design, no overhangs exceeding 45 degrees, all surfaces self-supporting, sloped transitions instead of flat horizontal overhangs, no floating geometry, no thin structures, minimum wall thickness above 1.2mm flat bottom surface for stable bed adhesion, simplified undercarriage, no cavities underneath, no recessed details, no sharp internal angles, rounded edges and fillets to improve printability low to medium polygon count, smooth but not highly detailed, no textures, no small gaps, no tiny features, no fragile parts, compact and sturdy structure, designed for easy slicing and printing print-ready model, single-piece closed volume, no intersecting meshes, no internal geometry