The PLA material used in CNC machining is a bio-based, biodegradable polymer. The CNC machining of PLA follows a standard subtractive manufacturing process, primarily comprising five stages: design, programming, fixturing, milling, and post-processing. This material features excellent machinability, high surface finish, eco-friendly biodegradability, good dimensional stability, and low-odor, non-toxic properties, making it particularly well-suited for producing high-precision prototypes, educational models, display pieces, and light-load functional components.