Issues with PID Tuning (RRF 3.4.0-b7)
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@argo It climbs up temp because of the secound K value
M307 H1 R5.035 K0.663:0.153 D4.06 E1.35 S1.00 B0 V24.4
Thats for fan compensation
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I changed the hotend while running RRF 3.4b7 (official b7 from github) so can't tell yet if it works well with 3.3 stable.
The Rapido Hotend comes with a full silicone sock and only a small tip of the nozzle is visible and can be targeted by the parts cooling fan.
The fan speed changes from 85% to 100% during a print. Before that I had a Mosquito Magnum which did not have any sock and did not have issues with temperatures (also 3.4b7).I just flashed 3.3 stable to compare the results and did PID tuning:
M307 H1 B0 R4.821 C119.7:101.0 D4.26 S1.00 V24.4
And here is the graph whilst printing with 3.3 stable:
Target temp is again 210°C and it keeps jumping between 209.3 - 210.5°C.
It's not perfect but far better than with 3.4b7 but still it struggles to hold the temperature whilst printing with that kind of heater. When idling and without the parts cooling fan running the temperature stays perfectly at 210°C.Next I'll try the classic heater PID without the fan included.
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Just did a new PID (still RRF 3.3) as a H(eater) and not T(ool) so there is no calibration with the fan included.
M307 H1 B0 R4.676 C121.5 D4.48 S1.00 V24.3
And the temperature is pretty stable during a print:
Should make no difference with RRF 3.4.0-b7 but I'll also test the PID as a heater and not tool.
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try firmware 3.4 beta 7+7
https://www.dropbox.com/sh/i5vox3xmkd55gaz/AAC19mI0WEC5GmEjLOBRbKs-a?dl=0
if you still have problems I help you in another way
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3.4 beta7+7 - the results were even worse with PID
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then for the bed try to give this code in duet web control
M303 H0 S80 Y3
Y3= 3 hysteresis cycles
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I have no PID issues with the bed.
The extruder PID calibration does not work for me when the parts cooling fan is included. Therefore I need to start the PID calibration as a heater and not as a tool.
The Rapido uses a different kind of heater which needs less power at higher temperatures. Maybe that is causing trouble for the PID calibration.
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ok try this code to calibrate as a tool M303 T0 S205 Y3
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undefined Phaedrux moved this topic from General Discussion
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Y3 or Y5 produce the same PID results which cause issues. Only solution I have atm is to use the old PID calibration which does not include the fan.
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then try to change these parameters:
I put my values try to use suitable values for you. you can find in config-override.g
try for example starting from your values to lower R and increase D
M307 H1 R2.762 D6.75
then put the string in duet web controll and press enter
digit M500 and press enter
make sure you have M501 at the end of config.g
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ok the geometry and type of material affect the pid adjustment
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undefined droftarts referenced this topic
