The Mechanical Hand-Cranked Fan is a fully functional, power-free cooling product designed to showcase mechanical movement through human effort. Built entirely through 3D printing with PLA, it merges technical precision with sustainable functionality, making it ideal for learning environments, exhibitions, or off-grid use. Inspired by the concept of human-powered appliances, it demonstrates basic mechanical motion and energy conversion while promoting low-energy, sustainable solutions through functional design. Every component, including the body, mechanical parts, and assembly pins, was 3D printed for durability, precision, and lightweight motion, eliminating the need for external screws or adhesives. Compact and durable, it is well-suited for demonstrations, educational models, or emergency use, and features an ergonomically designed crank for smooth manual rotation. The design reflects a deep understanding of technical drawing, motion, and mechanical interaction, earning appreciation for its clean execution, seamless assembly, and practical, electricity-free operation.