spiral shell 3d model

Create a fully continuous 360-degree sculptural form with no seams or breaks anywhere on the surface. The design must have flowing, wave-like, organic ridges that wrap smoothly around the entire geometry, with the front pattern matching perfectly on the back, forming a unified loop. Wall thickness must be precisely 2 mm everywhere. The shape should resemble a dynamic swirling shell with a hollow interior and a clean circular opening, maintaining smooth uninterrupted curvature. No disconnected parts, no sharp edges, and no interruptions in the flow of the pattern. High-resolution, watertight, manifold geometry suitable for 3D printing.