What is the difference between 3D printing and CNC machining?

CNC machining is different from 3D printing and injection molding such as some, 3D printing is an additive technology and injection molding is a molding manufacturing technology, which means that materials are added together during the manufacturing process to create the part, which is the exact opposite of the materials that are cut down for CNC machining, and when it comes to materials used for CNC machining virtually any kind of hard material can be CNC machined, and the most common materials are aluminum, brass, ABS, and nylon, etc. The best thing about CNC machining is its ability to build custom parts with very tight tolerances. This makes it one of the most accurate manufacturing techniques, with common tolerances for machining metals or plastics being around plus or minus 0.125 millimeters, allowing for the creation of tight tolerance features as low as 0.05 millimeters or even lower, which is about a quarter of the width of a human hair strand.