As we mentioned earlier, 3D printing is a kind of additive manufacturing. Its principle is to cut the model into N layers/N multi-points, and then stack them layer by layer/point by layer in order, just like building blocks. same. Therefore, 3D printing can effectively process and produce parts with complex structures, such as hollow parts, while it is difficult for CNC to process hollow parts. CNC machining is subtractive manufacturing. Through various high-speed tools, the required parts are cut according to the programmed tool path. Therefore, CNC machining can only process rounded corners with a certain radian, but cannot directly process internal right angles. It must be achieved through processes such as wire cutting/sparking. Outside right-angle CNC machining is no problem. Therefore, parts with internal right angles can be considered for 3D printing processing.

There is also a curved surface. If the surface area of the part is relatively large, it is recommended to choose 3D printing. CNC machining of the curved surface is very time-consuming, and if the programming and operator experience is not enough, it is easy to have obvious lines on the parts.