docs: Recommend running PID_CALIBRATE in Config_checks.md
Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
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@ -115,6 +115,29 @@ turns in the correct direction. If it does not, see the
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troubleshooting tips in the previous section to confirm the
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"enable_pin", "step_pin", and "dir_pin" settings for the extruder.
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### Calibrate PID settings
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Klipper supports
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[PID control](https://en.wikipedia.org/wiki/PID_controller) for the
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extruder and bed heaters. In order to use this control mechanism it is
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necessary to calibrate the PID settings on each printer. (PID settings
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found in other firmwares or in the example configuration files often
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work poorly.)
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To calibrate the extruder, navigate to the OctoPrint terminal tab and
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run the PID_CALIBRATE command. For example: `PID_CALIBRATE
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HEATER=extruder TARGET=170`
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At the completion of the tuning test, update the printer.cfg file with
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the recommended pid_Kp, pid_Ki, and pid_Kd values.
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If the printer has a heated bed and it supports being driven by PWM
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(Pulse Width Modulation) then it is recommended to use PID control for
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the bed. (When the bed heater is controlled using the PID algorithm it
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may turn on and off ten times a second, which may not be suitable for
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heaters using a mechanical switch.) A typical bed PID calibration
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command is: `PID_CALIBRATE HEATER=heater_bed TARGET=60`
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### Next steps
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This guide is intended to help with basic verification of pin settings
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