marker holder 3d model

Create a functional FDM 3D-printable holder for exactly 72 Artechio acrylic markers, arranged in a 6 × 12 grid. Each marker is 12 mm diameter and 168 mm long. Design it as a futuristic aggressive tactical MULTI-ROCKET-LAUNCHER, where each marker sits inside a cylindrical rocket-launcher-style tube. The holder should look like a compact military rocket launcher while remaining clearly a desktop marker organizer. The markers should be inserted vertically with a slight backward angle, approximately 10–15 degrees, so the colored marker ends are clearly visible and easy to remove. PRINTING PRIORITY: * FDM optimized * ZERO supports * Print directly on a flat build plate * One single solid object * No floating parts * No overhangs greater than 45° * Simple straight cylindrical openings * Open internal structure to reduce filament and print time * Lightweight but rigid * 2–3 mm structural walls * Use ribs and connecting frames instead of solid blocks * Flat stable base * No unnecessary de