@oliof said in Issues with pressure advance since RRF 3.4:

@PCR so do I (actually capable of triple play -- Marlin, RRF, and Klipper). I can't say I have these issues with bulging corners but I run quite high extruder jerk and acceleration (https://forum.duet3d.com/topic/33964/e-acceleration-has-to-be-limited-to-to-e-jerk-pa?_=1700602309451). I wonder what e jerk and acceleration the people heavily affected run; if jerk and accel aren't high enough I can see that PA may kick in "late" and not have (any) effect, especially at higher speeds.

So first of all we need to stop tuninig anything but testing the capability of the E motor.
Btw, any steps or details shown how to find out the value?

@hestiahuang

Someone shared me that, he has the same issue on RRF, however It comes to be fixed after he using the Klipper. Really no idea what's the diff.

@hestiahuang

Adjust the belt tension can not fix the problem.

@hestiahuang

Most likely it is obvious on CoreXY machine. When there is a corner, and moving before arrived the end of corner, both A motor and B motor, need to slow down, severe bulging will come before arriving the corner. If it is the machine like UM, it will be only severe bulging after corner but never before corner, as there is only one aixs motor for each aixs. However this is the inherent feature for CoreXY, due to it needs both A motor an B motor keep moving.

This is the first time I am using CoreXY machine, the E3D ToolChanger.

No clue how to fix it...

What I guess, PA can't fix this, as it is XY movement related, not extrusion related. However the Input shaping is the direction. RRF Input shaping is still the blackbox, a long way need to go.

https://forum.duet3d.com/topic/33803/unable-to-stop-severe-bulging-in-corners-with-new-print-head/29

The same issue in above link too.

I have the same issue on ToolChanger machine too. I haven't found out the root cause yet.

so don't miss Duet2Wifi...

@hestiahuang said in 3.5 B3 Toolboard stepper intermittently running backwards:

@dc42 said in 3.5 B3 Toolboard stepper intermittently running backwards:

@ctilley79 you are correct, the P parameter doesn't work for Neopixels. I will correct this before we release beta4.

May I know how to define M950 for Duet2Wifi? It can use M150 directly before, however it is failed and need definition first now. But not pin name found...

Add the source code to confirm my finding.

@dc42 said in 3.5 B3 Toolboard stepper intermittently running backwards:

@ctilley79 you are correct, the P parameter doesn't work for Neopixels. I will correct this before we release beta4.

May I know how to define M950 for Duet2Wifi? It can use M150 directly before, however it is failed and need definition first now. But not pin name found...

@dc42 said in M915 feature is loss after 3.5.0 beta2 version on extruder:

@hestiahuang I raised this issue https://github.com/Duet3D/RepRapFirmware/issues/847

thx for your help on that!