I engineered an innovative, leak-proof bottle cap focused on high-volume production efficiency and user ergonomics. Starting from initial concept sketches, I built the full CAD geometry in SolidWorks, incorporating a custom tamper-evident band and precision thread pitch. I integrated extensive DFM notes for injection molding, optimizing wall uniformity, core-side draft angles, and shut-off surfaces. The project culminated in photorealistic 3D renders that highlight tactile ribbing, parting lines, and vibrant plastic textures