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Changes to Step #13

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-[* black] Insert wisdom here.
+[title] Labeling the Thermistor Wires
+[* black] Up until this point the thermistor wires polarity has never mattered. However, with the new probing PCB polarity DOES matter. We need to differentiate between the positive and the negative.
+[* black] Locate the thermistor leads that are in the T0 location on the RAMBo board.
+[* black] Label the wire with a sharpie marker or similar) that is on the the bottom (closest to the stepper motor ports). This is the "Positive" wire and for the sake of explanation will be connected to the green wire in the top of the machine.

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