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The diamond operator <> lets the while loop iterate over the input file (our G-code) line-by-line. In this example, we just print back the unchanged content of the G-code line.
Most CNC workflows start with a 3D model, which is then passed to CAM software to be converted into the G-code language that CNC machines love and understand. G-code, however, is simple enough ...
YouTuber Ben Makes Everything shows off how he transformed his old 3D printer into a working photogrammetry rig.