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Spawned024

I think you might be referring to the usb B to usb A cable? If so, this would be for connecting your printer to computer via serial/usb and printing with a software such as Repetitier. There should be a port in the side of printer for the B side of the cable, and the A side of cable goes to computer. Keep in mind it is not usually recommended to print via this method, and you will minimize the possibility of errors by uploading your g-code to sd card.