Having issues PID Tuning Hemera

Turbo

For some reason I cant seem to get the PID tune to not overshoot on my hotend. My target temp is 210, but I'm regularly hitting avg. 216.
This is the heating section on the config.g file, with changes made to M305 P1 to match the E3D V6 tutorial, since its the same thermistor... right?

; Heaters
M307 H0 B0 S1.00                           ; disable bang-bang mode for the bed heater and set PWM limit
M305 P0 T100000 B3988 R4700                ; set thermistor + ADC parameters for heater 0
M143 H0 S120                               ; set temperature limit for heater 0 to 120C
M305 P1 B4725 C7.060000e-8 R4700           ; set thermistor + ADC parameters for heater 1
M143 H1 S280

This is the current PID tune found in config-override.g, after running more than 20 cycles with no improvement in overshoot.

M307 H1 A276.7 C144.1 D6.2 S1.00 V11.9 B0

I cant figure out what I'm missing and I can't seem to find any solution that works for me.

SIam

have you tried to delete the m307 command from the config.g and made a new pid tune?

Turbo

the M307 in the config.g file is for the bed. the m307 for the hotend is only found in the config-override.g file. I can try deleting it from the override file if that's what you mean?

SIam

sorry i mean the config-overide file

Turbo

This post is deleted!

Turbo

@SIam deleted the line and ran the tune again. The result were no different.

dc42

Apart from the initial overshoot, is the temperature stable?

Please confirm that you have no M301 commands in config.g or config-override.g.

Your M307 A value looks lower than usual and that could account for the problem. Perhaps you are tuning with the print cooling fan on but the overshoot is when the fan is off, and you don't have a silicone sock over the heater block?

adalton5683

@dc42 I am in the middle of tuning my hemera on my Duet 3 5+ mini.

Can you clarify your last statement? Should I tune with my fan off and the silicone sock off ?

Also another question while here, I mainly print in pla almost only pla. Should I tune to 210ish or to 300 like the hemera manual says? I dont think ill ever use that high of a heat.

Phaedrux

@adalton5683 said in Having issues PID Tuning Hemera:

Should I tune with my fan off and the silicone sock off ?

In general you should tune how you would be printing. So leave the sock on. In recent firmware you can tune with M303 T0 in order to tune the hotend as a tool including the fan. You leave the fan off and the firmware will turn it on to measure how much it causes the temp to drop so it can compensate.

Tune to the average temperature you'll be printing with. When they say to tune to 300 do you mean the hot tightening step?