did M303 S210 C8 and update PID in printer config. this is what I get when I run my hotend at 210c. it appear to fluctuate ±4deg c this is @Shai_Schechter mini hotend which uses ceramic heater. It heats up really really fast. but I’m used to large heater block and this rapid fluctuation is new to me. Is this normal?
Actually after further reading, it appear I need to decrease Ki and increase Kd = “less agitation from cumulative error, and more gliding into alignment with the target:…”
It looks as though the C8 value is not being respected. That seems like a bug. I tried it in master just now, only 4 cycles…
glad you caught that I didn’t even realize it was only doing 4 bumps instead of 8…
Is it possible that this setting cause the heater to bounce ± 4 deg c? I’m going to try to lower this number to say 0.5 and run the PID tune again.
nope. decreasing ok range does not affect anything… I tried different values combination changing the the PID numbers increasing and decreasing, it appear not to have any meaningful affect that is to reduce the rapid oscillation…
is there a way to reduce the power to the heater hot end? I think the heater might be delivering too much power?
There is no way to limit the Max power to the heater right now, but lowering the p value should definitely help you with the ringing.
I was testing changing D value manually to extreme from 0 to 150 but it didn’t change the graph… It should ease the oscillation but the graph appear unchanged… I’d it possible that my setting in printer config gets ignored just like the cycle number?
@Elias_Bakken I have the same situation - only 4 cycles.