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I'm using an Anet A8 with Marlin 1.1.6.

I've read countless guides on PID auto-tuning and never saw that the fan needed to be on, but when I look at the Marlin source code's ANet A8 configuration (here: example_configurations\ANet\A8\Configuration.h) it states:

 ... // ANET A8 Standard Extruder at 210 Degree Celsius and 100% Fan //(measured after M106 S255 with M303 E0 S210 C8) #define DEFAULT_Kp 21.0 #define DEFAULT_Ki 1.25 #define DEFAULT_Kd 86.0 #endif // PIDTEMP 

So, should activate the fan before running the auto-test if I wish to update the PID values in Marlin for my Anet A8?

1 Answer 1

You should run the fan at what you expect it to be at the majority of the time it is printing. If you tune at 100% fan and never use a fan then it will be too aggressive, if you tune at 0% fan and use the fan then you will struggle to maintain/reach temperature.