SG90 Servo Horn Needle Holder

3D Printable Model Prompt: "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). Part 1 – Horn attachment: A flat base matching the shape of the SG90 servo horn (single arm, approximately 20 mm long, 6 mm wide, 1.5–2 mm thick). Two or three mounting holes aligned with the horn's existing holes (diameter ~1.5 mm), for the servo's original screws. The base must be rigid and flat for optimal contact with the horn. Part 2 – Connecting body: From the end of the arm, a rigid extension (rod or tab) 15–20 mm long, extending outward from the attachment point. Part 3 – Needle/wire holder: At the end of this extension, a small hollow cylindrical socket (bore) with an adjustable diameter (default 1 mm, for a thin needle or rigid wire). The bore should go through 8–10 mm deep, with a slight tolerance (0.1–0.2 mm) to allow friction-fit insertion (the needle/wire holds tight without glue). Optional: add a small side slit or a grub screw for more secure retention if needed. General constraints: Minimal weight (the part must stay light to avoid overloading the servo). Wall thickness ≥ 1.2 mm for FDM printing strength. No supports needed if possible (flat print orientation)."

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