This article compares CNC machining and injection molding for manufacturing, detailing their respective pros and cons. CNC machining offers high precision, material versatility, and flexibility, making it ideal for prototypes and low-volume production. Injection molding provides cost efficiency and fast cycles for large-scale plastic production but requires expensive molds and less adaptability. The guide helps manufacturers choose the best production method based on volume, material, design complexity, cost, and lead time.