PA-Calibration with LA-Test

This is a fast calibration test for Pressure Advanced. The idea was from FHeilmann.

Requirements

At first, we have to add a gcode-macro to convert the M900 LA gcode to set the Pressure Advance value. Please add the following lines in your printer.cfg.

printer.cfg

[gcode_macro M900]
description: Set Pressure Advance
gcode: SET_PRESSURE_ADVANCE ADVANCE={params.K|default(0)}

Generate G-code

Now we use the Marlin k-factor tool to generate the G-code. Here are my parameters I used to generate the pattern in the picture above.

Change Hotend, Bed-Temperature and Retraction-Distance

Resize the bed to your size

Change the Retract Speed to your Retract-Speed

Ending Value max is 1 (Bowden). If you use a Direct-Drive printer, you can set the "Ending Value for K" to 0.25 and "K-faktor Stepping" to 0.01. If you like to print the Numbers per Line, check-in the "Line Numbering" (the numbers are horrible to remove from your buildplate).

Change the "Extrusion Multiplier" for you filament

Fill in a Filename in the field and click on "Generate G-code". Modify the Start-Gcode on the right side and click on "Download as file".

Print the G-code

Now print the pattern and look at which line is most constant. Count the lines from below and multiply with the "K-factor Stepping" value. This is your perfect Pressure Advance value.

Happy printing!