3D printed prosthetic socket liner = precise customization + lightweight + flexible breathability + rapid delivery + aesthetic realism, completely solving the traditional process pain points of "poor fit, pressure sores, bulkiness, long lead times, and unattractive appearance." It has become the preferred technology for medical-grade prosthetic socket liners, covering all scenarios including sockets, flexible inner liners, and decorative outer covers, significantly improving user comfort, mobility, and quality of life with dignity.