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This is true, but the LCD screen reports the running temperature of the bed and hotend, plus the percentage of the job done, plus it has a few other tricks it can do. Try commanding the motors to move without an LCD screen attached. That is, no Laptop, no PC, no Tablet or Phone connected to the USB connector.

And $15 Australian for the LCD complete isn't exactly a King's ransom these days for the ability to control the printer on it's own.

:)