
The project started with an existing bottle lid design that suffered from leakage, unclear internal geometry, and unreliable sealing behavior.
The client needed:
• A lid that would not leak when inverted
• A reliable straw and valve system
• Compatibility with an existing universal bottle thread
• A design that could be prototyped and tested quickly
Initial reference parts were available, but the internal geometry and sealing details were difficult to measure and reproduce accurately.
I reverse-engineered the lid system and rebuilt it as a clean, parametric, and manufacturable design.
My contribution included:
• Reverse engineering complex internal geometry from physical parts and scans
• Redesigning the straw, valve, and gasket interfaces for reliable sealing
• Refining spout rotation and sealing behavior
• Defining correct thread geometry and tolerances
• Optimizing all components for prototyping and future manufacturing
• Iterating based on real-world testing and client feedback
The final design resulted in a leak-resistant straw lid system that performs reliably under real use conditions.
The solution:
• Prevents leakage even when the bottle is inverted
• Maintains smooth and intuitive spout operation
• Uses clean, manufacturable geometry
• Is suitable for both prototyping and mass production
✔ Fully detailed SolidWorks assembly
✔ Reverse-engineered from real parts
✔ Prototype-tested using SLA and FDM prints
✔ Client-approved design
✔ Production-ready geometry