atom nucleus 3d model

Create ONLY a Rutherford atomic nucleus for 3D printing. Use EXACTLY 7 fused spheres: - 4 red protons - 3 blue neutrons The nucleus must form a balanced near-perfect sphere with uniform volume from all angles. No flattened back, sagging, stretching, melting, or sandbag shape. All spheres must slightly intersect and become ONE solid watertight manifold mesh. No holes, floating parts, internal faces, or duplicate geometry. Smooth rounded surface, clean topology, even polygons, optimized for 3D printing. Maximum 15000 polygons. No electrons, rings, shells, or background objects. Center at (0,0,0).