spiral seashell 3d model

Generate a watertight 3D model of a hollow flame-shaped lampshade. The outer shape must match the reference exactly, with smooth continuous wave patterns wrapping around the entire surface 360°, including the back. No open gaps or broken layers. The bottom opening should be perfectly round, flat-edged, and aligned for fitting onto a lamp base. The interior must be hollow with uniform 2mm wall thickness. Keep all wave forms soft, connected, and flowing together as one shell. Maintain the flame’s elegant twist, with full curvature continuity and no missing details. Use matte light gray material and neutral lighting for clean geometry visibility. Output must be manifold and 3D printable.