bas-relief coin 3d model

Create a high-resolution 3D bas-relief coin for 3D printing. Output a watertight, manifold STL. No textures, colors, or lighting—geometry only. Coin: 30 mm diameter, 2.5 mm thick, max relief 0.6 mm, beveled edge 0.3 mm. Style: engraved mint coin, crisp edges, clean topology, no noise, all details raised/recessed. Side A: Yggdrasil. Central trunk, roots down, branches up, balanced. Simple hanging symbols. Outer ring with runic border. Min thickness 0.4 mm. Side B: Red dragon head profile, roaring. Alive, not undead. Half flesh (scales, eye, horns), half skeletal (jawbone, teeth, socket), smooth transition. No thin spikes. Tech: manifold, no holes, no overlaps, even thickness, flat faces, <45° overhangs. Output: single centered STL, optimized mesh.