IUD Inserter Handle Assembly

Design a simple, 3D-printable two-piece clamshell handle for an IUD placement prototype. Use a smooth ergonomic body, approximately 125 mm long × 35 mm wide × 28 mm thick, with 2.5–3 mm wall thickness, rounded edges, alignment pins, and 4–6 M2/M2.5 screw bosses. Create a fully open rear loading channel for a separate, standard IUD inserter/slider. No door, latch, clip, or cover. The inserter must slide in from the rear and rest against an internal front alignment stop. Use shallow guide rails only. Start with a channel size of 14 mm wide × 10 mm high, adjustable after measuring the actual inserter. Add a centered front outlet for separately assembled tubing. Use a smooth internal bore and an externally threaded cylindrical connector: 11 mm outer diameter, M11 × 1.0 external thread, 10–12 mm thread length, plus a small base shoulder. Do not model tubing, orange clamp, sounding tube, IUD slider, or distal components. Mount a thumb-operated handwheel on one side of the handle near the middle/front. Wheel: 22–26 mm diameter, 5–7 mm thick, with grip ridges. Attach it to a transverse internal shaft supported by bearing bosses. Use the shaft as a two-groove string drum: Two adjacent circumferential grooves, one per steering string. Each groove: 1.2–1.5 mm wide and 1.0–1.5 mm deep. Add a raised center flange between grooves to prevent crossover. Route each string through its own enclosed, rounded internal guide channel toward the front outlet. Keep string paths separate from each other and from the central IUD-inserter channel. Add one simple mirrored flexure tension arm or idler guide per string to maintain light tension as the opposite string loosens during wheel rotation. This prevents loose string loops, tangling, and interference with the inserter. Keep this feature compact, printable, and accessible when the housing halves are opened. Internal layout: Center: open IUD-inserter channel. Left/right sides: isolated steering-string channels. Side compartment: handwheel shaft and two-groove drum. Divider walls between all three regions. Prioritize minimal part count, easy assembly, simple printable geometry, and clear internal separation of the slider, strings, and tubing connection.

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