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With the 12v heater cartridge the current draw is higher than most printer boards will be able to handle. So in order to not melt the connectors on your board you will need a MOSFET.

Connect the "Power In" side to a 12v DC power supply . Make sure you connect the +and - the correct way round.

If you are using the 24v heater cartridge then you can just connect the heater cartridge to the heater cartridge output from your printer board.