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Revision to Pressure advance

Jason Znack

== Methods of finding the right amount of pressure advance ==
-The most simple method of tuning pressure advance is to slice a cylinder of 100mm diameter and at least 100mm tall, 1 bottom layer, 1 or 2 perimeters, and minimal or no infill. Ensure cooling is adequate for printing an object with very short layer times. Ensure the Z seam is aligned to a single point. Use a print speed close to your normal print speed. Ensure your extruder steps per mm has been calibrated. Now start the print with pressure advance disabled. After a few layers enable pressure advance by sending the M572 command with your desired starting amount in the gcode console. You may notice a brief pause in movement while the value changes. Continue the print for a few more layers. Try various amounts above or below the starting value and pay attention to the Z seam. Too little PA may result in a bulge at the end of the perimeter before the layer change. Too much PA may result in a gap at the seam.
+The most simple method of tuning pressure advance is to slice a cylinder of 100mm diameter and at least 100mm tall, 1 bottom layer, 1 or 2 perimeters, and minimal or no infill. Ensure cooling is adequate for printing an object with very short layer times. Ensure the Z seam is aligned to a single point. Use a print speed close to your normal print speed. Ensure your extruder steps per mm has been calibrated. Ensure any wipe and coasting settings are disabled in the slicer.
+
+Now start the print with pressure advance disabled. After a few layers enable pressure advance by sending the M572 command with your desired starting amount in the gcode console. You may notice a brief pause in movement while the value changes. Continue the print for a few more layers. Try various amounts above or below the starting value and pay attention to the Z seam. Too little PA may result in a bulge at the end of the perimeter before the layer change. Too much PA may result in a gap at the seam.
A more detailed test using a customizable scripted Gcode file is described here: https://forum.duet3d.com/topic/6698/pressure-advance-calibration

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