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The path in which the CNC tool must travel to create the desired port shape is called the tool path. After creating a 3-D model of the ports and chamber, the projected tool path is put into motion on screen to check for potential hang-ups. The tool path is then run through a post processor to write the actual program, which is called the G-code. Different CNC machines have different axes and ranges of travel, so post processing software is specific to each machine.