Hot End Temps Fluctuating

KeeganB

I understand that, but maybe I'm confused. Is the PWM limit also adjusted by the Autotuning results?

I just ran: M303 H1 S200 P1.00 and Here are the results:

M307 H1
Heater 1 model: gain 277.6, time constant 192.4, dead time 4.0, max PWM 0.70, mode: PID
Computed PID parameters for setpoint change: P30.6, I0.159, D86.6
Computed PID parameters for load change: P30.6, I2.521, D86.6

That PWM of 0.70 is what was in my config-override before I started the autotune.

dc42

Thanks, looks like I need to update the firmware to carry the P factor from M303 over to the M307 parameters.

EDIT: I just checked the code. When tuning it uses the lower of the existing max PWM and the value you specified in the M303 command. I'll change that. For now, send M307 H1 S1 before you run M303.

KeeganB

@dc42:

Thanks, looks like I need to update the firmware to carry the P factor from M303 over to the M307 parameters.

EDIT: I just checked the code. When tuning it uses the lower of the existing max PWM and the value you specified in the M303 command. I'll change that. For now, send M307 H1 S1 before you run M303.

Thanks David,

I will give that a try before the next autotune. It is running a print right now. Do you think that could be part of my fluctuating temps? Its kinda what I am thinking, and is the path I'm following for now.

Thanks again!

KeeganB

I'm marking this as solved, as I believe that was the issue David. Thanks!