Is there any place in my CNC mill conversion setup where I at least should, or possibly even must, use shielded cables or wires? I know the USB cable that connects my all-in-one control/driver 4-axis board to the computer is already shielded, but what about the wires from the power supply to the board, or from the board to the steppers, or from the limit switches to the board? Naturally if plain wire will work fine I'll go that way since it's cheaper and available locally...