spiral seashell 3d model

Generate a fully seamless 360-degree object with perfectly continuous geometry. The surface must have identical flowing wave patterns that wrap around the entire form without any interruption, mirroring perfectly from front to back. No deformation, no change of direction, and no break in the pattern anywhere on the circumference. The model must be a closed, watertight, manifold shell with a uniform wall thickness of exactly 2 mm. The overall shape must be a smooth swirling organic shell with a single circular opening, and the swirling ridges must loop around the whole object in a perfectly repeated pattern. Absolutely no flat areas, no mismatched back side, and no abrupt transitions. High-resolution geometry suitable for 3D printing.