tow hitch cap 3d model

Create a functional 3D printable trailer hitch cover cap (European standard tow hitch, approx. 50 mm diameter ball). Requirements: The cap should fit snugly over a standard 50 mm tow hitch ball Include a small front opening/hole (approx. 8–12 mm diameter) for water drainage Add internal anti-slip retention features: 3–5 evenly spaced flexible retention tabs (“anti-slip noses”) on the inner wall Each tab should slightly protrude inward (~0.5–1 mm) Tabs should be slightly flexible (thin base, approx. 1–1.5 mm thickness) Rounded edges to avoid scratching the metal hitch ball Add slight internal tolerance (+0.3 mm excluding tab interference) for easy mounting Optional: slight conical taper inside to improve grip Outer shape: minimalistic, slightly rounded cylindrical or dome design Wall thickness: 2–3 mm Add outer grip texture (ridges or knurling) for easy removal Flat front surface (30–40 mm) for optional logo/customization Avoid overhangs >45° for supportfree printing Functional robust