Sanity check of my PA values

rilot

Hi all

I've been calibrating PA on my large (320x320) CoreXY build and wondered if someone could look over my numbers and see what they think.
My printer is using a 660mm bowden tube with a genuine Bondtech BMG extruder. Hotend is an E3D V6 with a 0.4mm nozzle.

I've been using a combination of the python script that does fast and slow moves, and conditionals in Prusaslicer when slicing a 40mm cube with 2 walls and rear seams.

I've come out with a PA value of 1.55 with Esun PLA+ at 225C which seems very high when compared to what other people are posting for bowden setups. If I drop the temperature to 205C which is more inline with the temperature I print on my other machines (running Marlin) I get values of well over 2.

To sanity check my own findings I swapped the hotend out with another E3D V6 I had (a Lite 6) and got the same numbers more or less.

Here are two tests. Both gradients start at 0.5 and end at 2.0:

I'm fairly new to RRF but very familiar with Marlin. On a slightly smaller printer running Marlin I get a LA value of 0.4 with a 400mm bowden tube. Are the numbers between PA and LA comparable or is that a red herring?

This is the relevant section of my config.g:

M566 X600 Y600 Z120 E1500                         	; Set maximum instantaneous speed changes (Jerk) (mm/min) 
M203 X10000 Y10000 Z600 E3600                      	; Set maximum speeds (mm/min) 
M201 X2500 Y2500 Z30 E8000			   	; Set accelerations (mm/s^2)
M204 P500                                               ; Set print acceleration
M906 X1600 Y1600 Z1600 E1600 I30                   	; Set motor currents (mA) and motor idle factor in per cent

Any thoughts greatly appreciated.

Phaedrux

@rilot said in Sanity check of my PA values:

Are the numbers between PA and LA comparable

Not really.

Trust the tuning and then verify with actual prints.

zapta

@rilot said in Sanity check of my PA values:

I've come out with a PA value of 1.55 with Esun PLA+ at 225C which seems very high when compared to what other people are posting

I got similar PA numbers with my 600mm bowden, BMG and V6 configuration. Then I change to a direct configuration, PA went down to 0.08 and print results got much better.

rilot

Well, I just did the same. Ditched the Bowden and went to direct drive. 0.11 PA and much better prints. I should have done this ages ago rather than fighting with the bowden.

Thanks.