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Controller? mainly bCNC, but I don't think that matters, as the grbl docs tell you how to talk to a controller. I know grbl is old and tired and...
USB is not something that works over distance. ethernet, yes, but a 20m USB costs a fortune (100$ or so) and the plotter bends the cable thosands...
I would like to add wireless to grbl, as the cables seem to be a source of error (and size - I need a 15m bed!). I have a few nrf24l01 wifi chips....