SG90 Servo Horn Needle Holder

3D Printable Model Prompt (corrected): "Design a mechanical plastic part (PLA/PETG) intended for 3D printing, functioning as an attachment fixed to the horn (arm) of a micro servo motor (SG90). Match the following exact structure: Part 1 – Flat mounting arm: A flat, straight rectangular arm matching the SG90 servo horn shape, approximately 20 mm long, 6 mm wide, 1.5–2 mm thick. Three aligned mounting holes evenly spaced along the arm (diameter ~1.5 mm), matching the horn's original screw holes. Keep the arm perfectly flat with no taper or thickness change along its length. Part 2 – Connecting rod: A thin, straight rod extending from the end of the flat arm, 15–20 mm long, with a constant width of 3–4 mm (narrower than the mounting arm, NOT wider) and thickness matching the arm (1.5–2 mm). Smooth, reinforced transition (small fillet) between the flat arm and the rod to avoid a weak point. Part 3 – Needle/wire holder (HOLLOW, not solid): At the end of the rod, a small cylindrical holder, 6–8 mm in diameter and 8–10 mm tall. CRITICAL: this cylinder must be HOLLOW with a bore drilled straight through its central axis, diameter 1 mm (adjustable), matching the diameter of the needle or wire to be inserted. The bore must go all the way through, not just a shallow indentation — depth 8–10 mm, with 0.1–0.2 mm tolerance for a friction-fit insertion (no glue needed). The cylinder must NOT be a solid rounded knob/mallet shape — it must remain a true hollow tube/socket. Optional: add a small side slit or a grub screw hole for extra retention. General constraints: Minimal weight (avoid overloading the servo). Wall thickness ≥ 1.2 mm for FDM printing strength. No supports needed if possible (flat print orientation). Overall proportions must match the reference: thin flat arm with 3 holes, thin connecting rod, small hollow cylindrical tip — NOT an oversized or bulky end piece."

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