Pressure Advance Calibration
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@imqqmi said in Pressure Advance Calibration:
Thanks for the script! Please note, to use the gcode you should use relative extrusions using M83, otherwise nothing is extruded. I think slic3r uses absolute extrusion M82. If you copy/paste startup gcode this could affect the print.
Slic3R can produce gcode with either relative or absolute extrusion. There is a check box under "Printer Settings". The important thing is that the slicer setting (and any other scripts) should match whatever the Duet is set to expect, which can be either relative or absolute.
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@digitalvision I just wanted to post a quick reply thanking you for this script. I wanted to try out pressure advance, but really had no clue whatsoever how to start calibrating it. With this script (and illustrated instructions), I was able to find that my direct drive titan extruder + e3dV6 benefits from a pressure advance setting of 0.09.
I thought that the number was a bit high for a V6 attached to the titan extruder (via a precision piezo orion), but I have to admit that the resulting improvement is easily visible.
thank you!
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Also found out about this script a few days ago and, man, was I wrong about the values I used. Turned out my Bowden setup runs best at 0.85, whereas I was using 0.2.
Rightly noted that under-extrusion should be compensated by nonlinear extrusion, not presure advance. These two features in combination doubled my print speeds while keeping the quality.
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How should I choose min and max speed for calibration script? Max speed is the overal speed(70mm/s for me) or outline speed? (42mm/s). Min speed correlates with jerk speed or ..? Thanks!
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Where is the link to the pressure advance test file?
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How do I read this result?
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@gnydick I would say that the range of PA values you used is still too low because it looks like none of the layers is continuously one thickness.
Manuel
Duet 3 6HC (v0.6) with RPi 4B on a custom Cartesian
with probably always latest firmware/DWC (incl. betas or self-compiled)
My Tool Collection -
@wilriker ok, thanks. Strange I need so much. I have a direct extruder with zero slack.
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How do you run the pressure advance test file? I see it's in python..Does it work similar to the linear advance website Marlin has where we can change the settings and it creates a .gcode file?
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It's nearly identical. Instead of building up vertically, the linear advance creates a single extrusion on the bed for each setting and labels it.
You have to run the python program to generate the output.
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@gnydick I just figured out how to run it. I changed the filament settings in the file before running it which I expect has to be done. I guess just edit the gcode to set the print temperature and turn on relative extrusion?
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Will ask again... How should I choose min and max speed for calibration script? Max speed is the overal speed(70mm/s for me) or outline speed? (42mm/s). Min speed correlates with jerk speed or ..? Thanks!
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@briskspirit I'd simply go with minimum and maximum speed that I'd ever use on the printer. It's not so much about speed as pressure management in extruder. I ran the script at 60-120 first and 30-200 later once basic kinks were ironed out. The speed difference should be enough to cause significant pressure differences.
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Hi, I've been reading this thread for a long time and I noticed that a lot of people, like me, are having problems to identify the best PA in their tests. So I tried to create a similar script that tries to give clearer results. I am no sure if I achieved my goal
, but I decided to share it anyway: https://www.thingiverse.com/thing:3442071All the instructions are in the Thingverse link.
Here is one of my prints using PA from 0 to 3. Yeah, I need to use really high values. I didn't completely understood why but my Capricorn (original) bowden tube is big, so maybe I need to shorten it.
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i tried to print this, and nothing came out...
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I want to share some of my experience tuning pressure advance. It was mentioned that you will need to recalibrate retraction.
I'm using a bowden tube setup and at higher speeds (100mm/s) I was missing material at the start of extrusion. Increasing prime amount would fix the higher speed problems but leave blobs at lower speeds (25mm/s). To resolve this I had to reduce the retraction distance. I ended up with retractions similar to a direct drive and no extra prime amount. I ended up with the following retract and pressure advance settings:
M207 S2.0 R0.0 F3600 T600
M572 D0 S0.3This is with the following setup:
E3D Volcano, 0.4mm nozzle
550mm Capricorn XS Bowden tube
Bondtech QR Extruder
1.75mm Amazon Basics PETGExtruder config settings per request: (these are not necessarily limits of the extruder)
M350 E32:32 ;microstepping
M92 E953:953 ;steps/mm
M906 E900:900 ;motor currents
M201 E1000:1000 ;accelerations
M203 E3600:3600 ;maximum speed
M566 E900:900 ;maximum jerk speedBefore Tuning these settings I was printing slower (50mm/s) with 6.5mm retraction distance.
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@rs4race said in Pressure Advance Calibration:
I want to share some of my experience tuning pressure advance. It was mentioned that you will need to recalibrate retraction.
I'm using a bowden tube setup and at higher speeds (100mm/s) I was missing material at the start of extrusion. Increasing prime amount would fix the higher speed problems but leave blobs at lower speeds (25mm/s). To resolve this I had to reduce the retraction distance. I ended up with retractions similar to a direct drive and no extra prime amount. I ended up with the following retract and pressure advance settings:
M207 S2.0 R0.0 F3600 T600
M572 D0 S0.3This is with the following setup:
E3D Volcano, 0.4mm nozzle
550mm Capricorn XS Bowden tube
Bondtech QR Extruder
1.75mm Amazon Basics PETGBefore Tuning these settings I was printing slower (50mm/s) with 6.5mm retraction distance.
Thanks for sharing this.
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@rs4race Could you also post your speed, jerk and accelleration settings for the extruder?
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When running the python script changing the center of bed to 110,110
This is a little snippet of the code it produces. Obviously X is off the charts. What am I doing wrong. Using python 3.7
G1 X3853.750 Y126.800 E0.2910 F4200
G1 X3858.750 Y126.800 E0.1663 F300
G1 X3867.500 Y126.800 E0.2910 F4200
G1 X3876.250 Y126.800 E0.2910 F4200
G1 X3881.250 Y126.800 E0.1663 F300
G1 X3890.000 Y126.800 E0.2910 F4200
G1 X3898.750 Y126.800 E0.2910 F4200
G1 X3903.750 Y126.800 E0.1663 F300
G1 X3912.500 Y126.800 E0.2910 F4200
G1 X3921.250 Y126.800 E0.2910 F4200
G1 X3926.250 Y126.800 E0.1663 F300
G1 X3935.000 Y126.800 E0.2910 F4200
G1 X3935.000 Y127.200 E0.0133 F4200I should note that python is giving me Indentation errors.
