Thus, when it comes to 3D printing, the STL model must first be converted to G-code. Simply put, it stores information that describes a 3D object, nothing more. While STL is a popular 3D printing format, its utility does not go beyond simply representing the outer surface of a 3D model. On the other hand, CNC machining and the movement of parts within a 3D printer are driven by a programming language known as G-code. At the center of 3D printing are two common and universal file formats: STL and Virtual Reality Modeling Language (VRML). CNC machining entails using milling tools to remove material from a block in order to create a 3D model. While the former is an additive method in that it involves adding molten material in layers to form a physical 3D model, the latter is subtractive. 3D printing and Computer Numerical Control (CNC) machining are some of the most popular processes.
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