Hello, We are working on a retrofit toilet seat mechanism and are looking for a CAD designer to convert a mechanical concept into a working prototype & subsequently manufacturable CAD models and drawings. We are looking for someone who can understand the mechanical problem statement and suggest necessary changes to the concept design if required. *Project Overview* The product is a spring-biased toilet seat ring lifting mechanism that: Keeps the seat ring upright by default Allows manual pull-down without snap-back Is fully retrofit on standard ceramic WCs Does not interfere with the lid Uses a torsion spring + friction stack (no motors) *What I Will Provide* A complete CAD handoff ZIP (concept text, interfaces, constraints) Retrofit constraints (existing WC mounting holes, seat freedom) *Scope of Work* Create parametric CAD models for: Mechanism Housing Mounting bracket Hinge shaft Torsion spring (spec-level) Friction stack Ensure: Seat ring remains free-rotating Torsion spring + Friction stack provide lifting torque Deliver: STEP files (manufacturing) STL files (prototyping) Assembly & exploded views Motion simulation screenshots Basic 2D workshop drawings 3D animation for working principle *Key Design Constraints* Must sit flush on ceramic WC surface No increase in rear seat height No snap-back (controlled return via friction/damping) Simple, low-part-count design preferred *Manufacturing Intent* Materials: SS, glass-filled nylon, spring steel Processes: CNC / injection molding/ 3D Printing Designed for small-batch manufacturing Support for prototyping and manufacturing is desirable. *Please confirm* Relevant experience Estimated timeline Commercial terms Once confirmed, I will immediately share the full CAD handoff package. Best regards, Sumit Thakral Vsecure TechMax