CNC motion controller is a link between personal computer and drivers for stepper or servo motors. It uses USB port which is available on all modern computers and laptops.
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Grbl Controller is designed to send GCode to CNC machines, such as 3D milling machines. It isn’t super smart, it just needs to give the user a nice way to get commands down to whatever controller they are using. Qt is pretty cool because you can create a nice GUI application for Windows, Mac and Linux.
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