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We now need to determine the final four existing hotend wires, and which is which in the bottom and top of the printer.

Of the four wires, they will be used for: Layer Fan, PS-ON, and (2) for I2C communication.

To start determine which of the wires is connected to the Fan 0 - location on the RAMBo board. Use your multimeter for this determination. After you have determined which of the existing wires it is, label the wire Layer Fan/Orange. (I used a post it note shown in step 27 to label the wires)

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