spiral vase 3d model

“Generate a watertight 3D model of a smooth S-shaped funnel that is a hollow tube with a continuous internal channel running completely through the object from inlet to outlet (true through-hole). Both ends must be fully open with no caps or obstructions. Dimensions (mm): – Total height: 45.0 – Inlet inner diameter (small opening): 3.175 – Outlet inner diameter (large opening): 20.0 – Wall thickness: 1.5875 (uniform everywhere) – Minimum internal diameter anywhere along the curve: ≥ 3.175 (no pinch points) Geometry requirements: – Circular cross-section at every point – Inner diameter increases smoothly and continuously from 3.175 mm to 20 mm using an exponential or spline-based flare (no linear segments) – Interior surface must be perfectly smooth: no steps, ridges, lips, ledges, seams, or sudden diameter changes – The S-curve centerline must be smooth and gentle (no kinks, no sharp bends) – Verify in cross-section that the internal channel is uninterrupted and fully open from end to end.”**