anatomical heart 3d model

Create a realistic anatomical 3D model of a full human heart designed specifically for 3D printing. The overall size should be approximately 80 mm in total height (about a 40 mm radius scale). The model must be completely hollow inside, with a uniform wall thickness of exactly 3 mm across the entire surface. The interior should be entirely empty, with no internal chambers, valves, or trabeculae structures. Ensure the mesh is fully watertight, manifold, and free of non-printable geometry. Include accurate external anatomical features such as the left and right ventricles, left and right atria (external shape only), apex, and a simplified coronary sulcus. Add the major great vessels: aorta, pulmonary trunk, superior vena cava, and inferior vena cava. These vessels should be short hollow cylindrical extensions (approximately 10–15 mm long) and connected directly to the internal cavity. Do not include microvasculature or fine coronary arteries. Maintain smooth curvature and clean topolog