PID manual tunning help needed

apak

Hello.

Delta Printer, SmartEffector with Volcano and silicon sock on the heater block.
nozzle 1.2, set to 22mm3/s limit ant slicer.

FW 3.6.1 RC1

PID autotune with M303 T0 S250, Nozzle at the center of the heated bed at room temp and at Z=5

Autopid successfull, stored and working.

Start print with PLA at 220ºC, first layer fan off.

At second layer, fan at 100%, temperature starts droping, and could not reach again target temp (220)

My only change to have temp at target is settings fan al 58%.

I am planning to update heater to a 80W, but I also want to know if there is a chance that my current pid can be manual tunned to gain some "power" when fan is at 100%.

No need really because printing speed at 1.5 width and 0.5 height limits speed to about 40mm/sec, nad pla is cooled fine with fan al 58%, but would learn how to tweak pid so can have fan at 100%. Could heater stepfordward help somehow?

This is my actual pid config.

I just asked chtgpt how could I tune ir, and will try it later
https://chatgpt.com/share/67e11718-3250-800f-9be8-a58d467c3aa4

M307 H1 R1.588 K0.266:0.074 D7.56 E1.35 S1.00 B0 V23.5

Thanks...

dc42

@apak the second K parameter (currently 0.074 in your configuration) specifies how much turning the fan on at full speed increases the cooling. So increasing that may solve your issue. Alternatively, try running a PID tune with the nozzle only 0.5 or 1mm above the bed and see if that results in that second K parameter being set higher.

It's also possible that the PID tune is giving the correct results but the problem is the extra heat needed to melt the filament. If that's the case then configuring heater feedforward may help, if your current heater is capable of supplying enough heat.

apak

@dc42 said in PID manual tunning help needed:

It's also possible that the PID tune is giving the correct results but the problem is the extra heat needed to melt the filament. If that's the case then configuring heater feedforward may help, if your current heater is capable of supplying enough heat.

I will try both things, Thanks. My bet is that a 1.75 mm filament and a 1.5x0.5 extrusion are hard to do with an old school volcano, but sure it can be tunned a bit....

apak

@apak Changed heater from 30W to 70W and problem was gone....