Yeah it’s me again. With marlin my printer printed with barely any noises but with Klipper its clearly audible.I think the noise comes from the extruder as if it tries to push to fast (60mm/s max speed, retraction off). Especially when it comes to infill or bottom/top layers. The prints do look good though. Any Ideas?
I made a video:
Is it possible that this is because I use a bondtech extruder? I found some old threads on github. Does anyone use one and could share his config
[extruder]
max_extrude_only_distance: 700.0
step_pin: PB3
dir_pin: PB4
enable_pin: !PC3
microsteps: 16
rotation_distance: 7.467 #Bondtech Dual Drive Extruder / 33.500 default
nozzle_diameter: 0.400
filament_diameter: 1.750
heater_pin: PA1
sensor_type: EPCOS 100K B57560G104F
sensor_pin: PC5
#control: pid
#pid_Kp: 21.527
#pid_Ki: 1.063
#pid_Kd: 108.982
min_temp: 0
max_temp: 250
pressure_advance = 0.848
This is caused by the very large pressure advance value you’re using.
This Value is too big? the docs state
so I found 0.8 plausible after calculations.
I don’t know. This does not sound like an extruder noise to me but rather high X/Y A/B acceleration with something not adequately tight. Were you able to isolate the noise specifically to the extruder? I currently use 0.64 for pressure advance on my CR-10S Pro with a Bowden and the extruder is totally silent, despite the very hard workout it’s getting.
If you are sure it’s your extruder, look for anything bottoming out or touching during reciprocating moves.
If you are not sure it’s your extruder, repeat part of a print that was making the noise without pressure advance (comment out the line) to see if the noise persists.
I disabled pressure advance and it’s much quiter. So it seems that pressure advance comes with extruder noises - I’ll try to lower the value even though my prints looks pretty good with this value
PA puts extra load on the extruder by making sure that residual pressure in the nozzle is bled off at the end of a move and reestablished at the beginning of a new move.
This is causing an “extra mile” that the extruder needs to go. The higher your PA value is the more extra extruder movement is generated.
Basically this is nothing bad as long as the noise is not related to skipping steps of the extruder. If your extrusion system cannot cope with the constant pressure / torque changes and starts skipping steps or grinding filament it will negatively impact print quality.
Going from a bowden system to a direct drive extruder can easily reduce the needed PA by a factor of 10.
this makes totally sense to me. since it’s easily activated/ decaticvated I can live with that. Just wanted to know the reason behind it. Thanks for your nice and informative answers.