hexagon keychain 3d model

Create a precise 3D printable mesh (STL) of a hexagon keychain with exact dimensions and clean topology. Shape: regular hexagon with rounded corners (fillet radius 2 mm) Width: 35 mm Height: 40 mm Thickness: 4.5 mm Add a top loop (keyring hole): Outer diameter: 8 mm Inner hole diameter: 4 mm Smooth connection to body with fillet (1.5 mm) Front side: Embossed stylized "F" logo (raised 0.8 mm) Engraved text "FLOWRIX" at bottom (depth 0.6 mm) Clean bevel edges (0.5 mm) Back side: Engraved NFC symbol centered (depth 0.6 mm) Flat circular NFC area (diameter 28 mm, thickness under it max 1.2 mm) Structure: Solid body (no hollow) Manifold mesh, watertight No non-manifold edges No self-intersections Print optimization: Minimum wall thickness 1.2 mm Smooth surfaces for FDM printing No supports required (optimized angles < 45°) Output: clean STL mesh, high resolution, quad-based topology if possible, centered at origin, real-world scale in millimeters