3.4b3 speed variations

[Serge]

Hello, I have a printing problem on SBC + Duet3. Indeed, during printing the requested speed is 80mm / s during long straight lines and the head only reaches 62mm / s maximum with a cyclic speed variation. on arrival of the changes of direction, the head slows down considerably in the order of 5 mm / s with a very strong under extrusion. I performed the 3.4b3 update yesterday. Do you have a clue? Thanks in advance.

config.g

[chrishamm]

@serge It's most likely caused by PA + your low extruder jerk (instantaneous speed change). Once you increase it, you'll find that the print speed increases, too. See here for further details.

[Phaedrux]

Try these values for E

M566 E3000
M203 E6000
M201 E3000

That should allow pressure advance to work properly