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Compatible with RepRap Ramps 1.4, this 4x20 Character LCD Kit is an intelligent control card that you can use to select the file to print on 3D printers and to make calibra- tions independently of the computer.
On the LCD Card there is a 4x20 character LCD screen with white on blue, a potentiometer (the potentiometer is also used as a button) to make menus, a stop button, a buzzer for warning output, a trimpot and SD card socket to adjust the contrast of the LCD.
With this card, you can perform all calibrations on the computer without any need, you can print the g-code you have loaded on the SD card directly from your 3D printer.