Printer Model: Sapphire plus
MCU / Printerboard: BTT SKR Mini E3 v1.2
klippy.log
I was doing PA today and after that i am facing huge noise from extruder,
here is the video link : WhatsApp Video 2023-12-11 at 1.12.40 AM
klippy.log (2.3 MB)
here is what i configured in slicer:
attaching slicer configuration as well,
can anyone help me to identify issue?
Your PA value is much too high.
PA causes additional stress for the extruder because it very fast adapts the extruder movements to compensate the pressure build up in the nozzle.
The higher the PA the more stress for the extruder and at a certain point the extruder motor and mechanics are no longer able to physically follow this.
Also refer to Pressure advance - Klipper documentation
Thanks a lot for the response,
i have done PA tuning(line method) and ended up with value of 1.82,(previously it was 0.025, which was a rough value i kept).
since i updated the PA values, what ll things needs to be considered from slicer and firmware.
This value is much too high. Anything above 1 has a good chance of causing more issues than do any good.
On a proper setup and good quality bowden extruder you should get away with values between 0.6 and 0.8
Make sure:
Make sure to deactivate all Slicer functions that interfere with PA, e.g. Coasting, Slicer internal K factor corrections, “Dynamic acceleration / extrusion blabla” etc.
Sure, i will try to change the tube, I am in kuwait now and getting anything here is bit pain as it comes to shipping and customs.
i have ordered official upgrade kit for sapphire 2 weeks back still didn’t received.
i will play around with slicer and update you as well
i have changed the tube, with the best one i can get locally, trying to do PA again
With this image I assume a partial clogged nozzle.
Before wasting filament on PA tuning verify the obvious: print with disabled PA and check whether the strange noises are still present or not.
Check as well what @EddyMI3D mentioned: (partially) clogged nozzle. Maybe the bowden does not have proper contact to the nozzle or is loose and filament is leaking.
Such high PA values do stress your feeder extremely and often do not really produce better quality.
Maybe you can mount the feeder closer to the print head so that the bowden can be shorter and if arrived properly install the Capricorn bowden.
Otherwise with properly set acceleration, speed and flow even smaller PA values can be fine.
To cite the documentation:
Typical pressure advance values are between 0.050 and 1.000 (the high end usually only with bowden extruders). If there is no significant improvement with a pressure advance up to 1.000, then pressure advance is unlikely to improve the quality of prints. Return to a default configuration with pressure advance disabled.
HI
i have changed the nozzle to and pushed filament manually and make sure it is coming without issue.
The nozzle is rarely the problem for such an issue!
Important on such a 4.1 bowden setup is that the bowden is cut totally flat and perpendicular on the nozzle side and is properly fitting against the nozzle end with slight pressure.
This ensures no leaking of molten filament.
If you press the molten filament by hand through the hotend it does not say anything other than there is no permanent obstruction.
This topic can be very frustrating… And chinese hotends right from the factory are prone to such issues! 
I would also not recommend this line method anymore.
It might seem to be a time-saver, but is highly susceptible to your first layer quality. Better use the method as described in the official Klipper documentation.
HI
I have managed to get Capricorn and changed with that, even after changing nozzle, there was a leak, which also fixed.
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