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Heater tuning allows RepRapFirmware to find the ideal parameters for the heater model, allowing for quick heat up times, and stable temperatures, with little overshoot. For full details, see: Tuning the heater temperature control

Ensure the test is started with the heaters at room temperature. Ideally this should be done with no filament loaded. For most accurate results, set the part cooling fan speed to match normal print fan speeds. For the Ender 3 and PLA that would be 75-100%

Next send M303 H1 S210 to start the heater tuning process for the hot end. Wait for the process to complete. It should only take a few minutes. Save the results by sending M500 so that they are loaded automatically at startup.

If you followed the configuration guide, automatic loading of the config-override file should be enabled. If you get an error message saying otherwise, add M501 to the end of config.g

PID tuning should be redone whenever a major modification is done to the hot end or bed heater, such as installing or removing a silicone heater block sock, or changing the part cooling fan, or even if the ambient temperature of the room the printer is in changes from season to season.

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