I'm seeking a detailed CAD design for a round, leak-proof lid for a protein shaker. The lid should be designed to accommodate a compound of silicone and BPA-free plastic. Requirements: - Round shape - Leak-proof sealing - Compatible with silicone and BPA-free plastic materials Ideal Skills & Experience: - Proficiency in CAD software - Experience with product design, especially for consumer goods - Knowledge of silicone and BPA-free plastic properties Looking forward to your bids!