Rack-Pinion ID Card Case

Create a **functional 3D-printable ID card case** for a card sized **85 × 55 × 0.80 mm**. The card must slide **in and out along its 85 mm width**, exiting through one of the **55 mm sides**. Use a **rack-and-pinion mechanism**: attach a straight rack to a sliding card tray and mesh it with a rotating external thumb wheel/pinion. Turning the wheel one way must extend the card; turning it the opposite way must fully retract it. Requirements: * Card tray with about **0.25–0.30 mm side clearance** and **0.20–0.30 mm thickness clearance**. * Case wall thickness about **2–2.5 mm**. * Internal guides and end stops to prevent jamming or the tray coming out. * Gear teeth large enough for reliable FDM printing. * About **0.25–0.35 mm clearance** between moving parts. * External wheel easy to rotate with a thumb and fixed on an axle. * Separate printable parts where needed: case, sliding tray with rack, pinion/thumb wheel, and removable cover. * Optimize for **FDM, 0.4 mm nozzle, PLA/PLA+**, minimal supports, and practical assembly. The final result must be a **working mechanical card case**, not just a visual model.

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