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Revision to M303

David Crocker

* ***Annn*** (RRF 3.2 and later, optional) ambient temperature - use this parameter if you want to tune a heater that has been on and has not cooled down to ambient temperature yet
* ***Ynn*** (RRF 3.3beta3 and later optional) Tuning cycle hysteresis, default 5C. When tuning bed heaters that are slow to cool down, tuning will be faster if you use a lower value, provided that there is no noise in the temperature readings.
-* ***F***nn (RRF 3.3beta3 and later) Fan PWM to use when the print cooling fan is turned on (ignored if the T parameter is not present), default 1.0. Use a lower value if youpr printer uses a powerful print cooling fan that you do not normally run at full PWM.
+* ***F***nn (RRF 3.3beta3 and later) Fan PWM to use when the print cooling fan is turned on (ignored if the T parameter is not present), default 1.0. Use a lower value if your printer uses a powerful print cooling fan that you do not normally run at full PWM.
***Examples***

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