drill-bit pen holder 3d model

Create a pen holder shaped as a smooth cylindrical cup. The inner body is a single, continuous cylinder, perfectly smooth like a glass interior. Drill-bit shaped twisted elements are placed ONLY on the outside of the cup as decorative shells. The drill-bit elements do not define the wall thickness and do not affect the inner surface. The inner surface must remain one continuous solid piece with no gaps, seams, or visible holes. Open top, flat base, metal material.