robotica keychain 3d model

3D-printable keychain: 70 × 20 × 4 mm. Rectangular base, 4 mm rounded corners, flat back. Subtle engraved circuit patterns on top surface (0.4 mm deep). Text "ROBOTICA" (R-O-B-O-T-I-C-A, 8 letters): uppercase, bold futuristic font (Orbitron or Eurostile), kerning +10% wider, each letter as independent solid geometry, minimum stroke width 2 mm, extruded 1.5 mm above base, 0.8 mm filleted edges. Keyring hole: 5 mm diameter, centered 6 mm from short edge, reinforced with 1 mm collar and 1.5 mm raised ring. Two separate shells for dual-color FDM: base (color 1) + text (color 2). Fully manifold, no non-manifold edges, minimum wall thickness 1.2 mm. Binary STL, 0.05 mm tessellation. Print flat, no supports.