3D printers not only use programming languages but also use control codes to generate the object. If you are referring to the language that tells a printer how to interpret the 3D model then the answer is GCODE. It is a file that contains the list of commands and coordinates.
If we talked about control codes then these are like assembly languages but the only difference is that the input comes from “compiling” 3D CAD files. Although most of the 3D printer software is written in Python, Java, C++.
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