Cable-tie all cables together as additional strain relief.
It is important to ensure the wires of the fan and the red/black section of the thermistor cable are cable-tied and strain relieved in such a way that they cannot come into contact with the heater block at any time.
Fan should be wired directly to a 12v power supply and be constantly running. Do not connect to a "Fan" output of a controller board or similar; those are for fans that cool the printed object, not a hotend fan which needs to always be running.
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