Choose how many heating cycles (repetitions of heating the element up to and down from the target temperature) you want to run.
The more cycles, the longer it takes, but the more accurate the results.
The default number of heating cycles is 5.
Enter “M303 E{heater number} S{target temperature} C{number of cycles}” and then send it using your G-code terminal. For example, “M303 E0 S230 C7” will PID tune the first heater to 230 °C using 7 cycles.
Wait for the terminal to finish cycling and show the calculated P, I, and D values. These will read as “kP, kI, kD”.
Enter “M301” followed by “P{generated kP value} I{generated kI value} D{generated kD value}” and send the command. For example, “M301 P70 I3 D65” will input new hot end PID values of P = 70, I = 3, D = 65.
Send the M500 command to save and store these values to your mainboard. Or, if you prefer to use the LCD interface, you can accomplish the same task by selecting, “Save Settings”.
M303 E0 S242 C40
M301 P70 I3 D65
M500