Pressure Advance Calibration

[sunnywilson09]

I know, but this is a bit silly.
I am using a cloned Titan extruder. A bad clone.

[strips]

Just want to share a few changes I made in the python script.

• Prints a box instead of two walls
• Tidied up the skirt generation as id did some strange moves
• has a text block for starting gcode and end gcode

advance_cal_box.py.txt

[MartinNYHC]

May I ask for help interpreting the result? Looks like the higher PA is the better the result? I'm using a direct drive. Thanks.

[MartinNYHC]

This post is deleted!

[Phaedrux]

@MartinNYHC Yes it would appear that way buy you should also test with an actual print to check for any unintended behaviours of running with a high pressure advance value.

How long is your bowden tube? Have you tried the cube wall method shown here? https://duet3d.dozuki.com/Wiki/Pressure_advance#Section_Simplest_Method_Possible

[MartinNYHC]

@Phaedrux There's only a short PTFE tube between extruder and hotend. I think it's about 20mm. Will do some additional tests today.

[avion23]

I've updated the *.py file with

• preamble
• postamble
• klipper compatibility
• Marlin compatibility

advance_cal.py

These are my results:
Delta Fyling extruder PA 0 - 0.5 over 40mm PLA

Delta Fyling extruder PA 0 - 0.5 over 40mm PLA carbon fiber

[duosvid]

I have tuned PA according to the method in the wiki, not with the script, but by printing a 100mm cube and adjusting on the fly. I have settled on 0.7, with a bowden tube of around 480mm length.

[duosvid]

@duosvid said in Pressure Advance Calibration:

I have tuned PA according to the method in the wiki, not with the script, but by printing a 100mm cube and adjusting on the fly. I have settled on 0.7, with a bowden tube of around 480mm length.

overall surface and z-seam look better, I'm now getting gaps in the infill - not in the parameters though . .

[Phaedrux]

@duosvid said in Pressure Advance Calibration:

@duosvid said in Pressure Advance Calibration:

I have tuned PA according to the method in the wiki, not with the script, but by printing a 100mm cube and adjusting on the fly. I have settled on 0.7, with a bowden tube of around 480mm length.

overall surface and z-seam look better, I'm now getting gaps in the infill - not in the parameters though . .

It's not uncommon to need to increase perimeter overlap slightly after tuning pressure advance.

[tmitch205]

@dc42 said in Pressure Advance Calibration:

Yes that's a valid approach. It's on our list to add a generator of pressure advance tests scripts to reprapfirmware.org, but it hasn't happened yet.

I know this is a super old thread but wanted to check anyway. Has the generator been created and added? If so, could you provide the link, please?

[jay_s_uk]

@tmitch205 my version of the klipper one generated RRF compatible pressure advance tests https://jaysuk.github.io/Voron/PA/pressure_advance.html

[sym]

Couldn't get this working, turns out Powershell encodes terminal output as UTF16LE. It will crash the Duet when you try to start it. Convert to UTF8 and smooth sailing.

Thanks!