Legacy Mark Medallion - CAD Development Specification This document provides dimensional specifications, architectural requirements, and reference layouts required for CAD development of the Legacy Mark Medallion for MSLA 3D printing production. 1. Overall Envelope • Outside Diameter: 44.45 mm (1.750 in) • Total Assembled Thickness: 5.00 mm • Rope Border Width (radial): 1.80 mm • Rope Inner Diameter: 40.85 mm • Target Weight (with SS disc + NFC): 36–38 g 2. Architecture Two-piece clamshell architecture: • Front Shell (Cup Geometry) • Back Insert Shell • Internal Stainless Steel Disc (304 SS, 3.0 mm thick) • 25.4 mm recessed NFC (front-mounted) 3. Internal Stainless Steel Disc • Diameter: 40.85 mm • Thickness: 3.00 mm • Tolerance: ±0.05 mm • Edge break: 0.2 mm chamfer 4. Shell Wall Thickness • Nominal Resin Wall Thickness: 1.0–1.2 mm • Minimum allowed: 0.9 mm • Z-step bonding seat required for shear strength • Glue gutters: 0.6 mm wide x 0.3 mm deep 5. Alignment & Anti-Rotation • Primary Key: Triangular pin @ 0° axis • Secondary Pins: 2 round pins @ 120° spacing • Bolt circle radius: 18.5 mm • Corner fillets: ≥0.3 mm 6. NFC Recess (Front Face) • Diameter: 25.4 mm (1.00 in) • Depth: 1.5 mm • Flat bottom surface • 0.2 mm chamfer at edge 7. Front Face Text Placement Text to follow circular arc based on polar axis system: • 0° = Top center • 90° = Right • 180° = Bottom • 270° = Left Top Arc (Centered at 0°): Primary Title Text Bottom Arc (Centered at 180°): Edition Text Raised rope border defines outer visual frame. 8. Surface Finish Requirements • All cosmetic faces must be free of support marks • Front face fully cosmetic • Back seam concealed under rope geometry • Designed for MSLA resin shrink (0.5–1%) Reference Diagrams to be provided