There are many ways to produce high-precision plastic parts.  Modern industrial grade plastics are cast, injection molded, printed or machined.  The first three options are ideal for manufacturing parts with complex geometries that have an excellent surface finish.  But when you need to achieve tight tolerances or produce a mirror-like surface finish on almost any type of part, nothing beats machining.  About 80% of the plastic parts are CNC milled.  This is the most widely used method for manufacturing parts without an axis of rotation.  All the rest are usually opened on a lathe.  To achieve an excellent surface finish, CNC machined parts are polished or chemically treated.

CNC machining plastic parts is a common manufacturing process used to produce a wide variety of components.  CNC machining involves the use of computer-controlled machines to remove material from a solid block or sheet of plastic to create the desired shape.