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Editing Step 6 —

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For safety it is strongly recommended to make sure that your printer detects if the thermistor stops sending correct temperatures for any reason.

Set the first highlighted line to: #define HEATER_0_MINTEMP 5 (or adjust the line corresponding to the hotend you're changing.)

In newer versions of Marlin there are other features such as Thermal Runaway Protection that might be useful as well, though they are typically on by default.