I need a fresh, shelf-ready design for a manual toothbrush whose main selling point is an ergonomic plastic handle. Comfort, balance, and a secure grip are the priorities. The handle will be injection-moulded in plastic, so please factor in draft angles, wall thickness, and texture options that provide non-slip tactility without driving up mould costs. The brushing head is yours to style—layout, tuft pattern, and colour blocking can all be explored—as long as the overall silhouette remains modern and distinctive. Soft bristles or an integrated tongue cleaner are not required right now, though I’m open to seeing how those features could be integrated in later iterations. Deliverables • 2–3 concept sketches illustrating overall form and ergonomics • Final 3D CAD model (STEP or IGES) suitable for tooling • High-resolution renderings for presentation and packaging mock-ups • A short material and manufacturing note explaining plastic grade, surface finish, and expected production considerations Acceptance criteria • Handle geometry accommodates a wide adult hand span (95th percentile) and passes a basic thumb-to-grip comfort check • Model is fully watertight and ready for injection-mould flow analysis • All files open cleanly in SolidWorks and Fusion 360 without repair Please include a link to at least one similar consumer product you have designed so I can gauge style fit.