Posts made by Argo

@dc42

I can confirm the issues are gone with Duet 3 Mini 5 + Toolboard 1LC

@Exerqtor

It seems it only temporarily fixed the issue. I just startet my printer for the first time since I was able to successfully print a Voron test cube and when inserting filament via PanelDue the extruder runs backwards at 5mm/s and forward at 10 mm/s when commanding it to extrude. With other words the bug came back

@ctilley79

Yes, I also had this issue and the extruder was overall extruding a bit too much filament whilst printing. My normally calibrated extrusion multiplier set in the slicer would not work anymore.

What helped:

• Duet 3 Mini5+ reset + Toolboard 1.2 reset (via button)
• formatted the SD card and copied just the config files
• flashed the Duet 3 Mini 5+ directly over the boot loader as a mounted drive to a PC and then flashed the Toolboard over the web interface

Now the reverse running extruder issue is gone and also my set extrusion multiplier works again.

I don't know what caused the issue tbh. Maybe the countless flashings over the web interface with all the beta versions (I also flashed Klipper to it fort testing purpose) causes issues over time but that's just a wild guess on my side.

@CCS86

Thanks but Flow is tuned right but it won’t work this this beta release. Flashing to previous build or Klipper and the problem is gone.

@CCS86

Worked flawlessly for the past 6 years on several printers.

Pressure advance / corners have been vastly improved! Corners are crisp and infill lines are strong even with input shaping enabled.

Edit:

I take my below reporting back. The printer was behaving very odd today. The extruder changed it's direction and changed it back after pausing. I decided to format the SD card + Reset the board with the button + Flashed the firmware via the boot loader / mounted the board directly to the PC.
Now the printer is behaving as expected and the extrusion issue is also gone. I don't know what went wrong there. Maybe the countless flashes with RRF and Klipper I did in the past did leave some left overs.
I had something similar back in the Duet 2 days after several beta flashes where I also had a bug which I could not reproduce after resetting the board.

But another thing is new and I've just checked my e-steps to rule that out: My slicer extrusion multiplier decreased from 0.91 to 0.89 for PLA.
Is anyone else noticing that? As long as PA is working fine I can live with that but it's odd that after the update I had to re-calibrate my EM.

Edit:
I've had to decrease EM to 0.868 in order to have a mechanical fit of two parts without much friction.
But you can see that the layers have gaps which indicates under extrusion. My old calibrated EM was 0.91.
Something seems off I guess?

@ctilley79

I'd say it's a 80% improvement to before and compared to my printers with Klipper or Bambu X1.
So it was definitely a step in the right direction.

@Monteaup

It seems some extruder / hotends cause issues with the PA implemenation we have atm with RRF.
With Klipper you also would need to play around with "PA smooth time" so PA does work properly. Maybe we'll see such implementation in RRF anytime soon.

I already tested different slicers and settings also different RRF versions.

Only thing that helped with my machine was connecting Klipper (Pi).
I suspect that PA smooth time is the factor (feature) that is RRF missing to improve this.

But the reasons why my bedslinger (also RRF with Duet 3 Mini) produces better corners? I don't know. My Voron (printer with the issues) uses a different kind of hotend which is also not compatible with the PID algorithm RRF uses as PID tuning only works when calibrating the hotend as heater and not as a tool But that's another issue I already reported in another thread.

@Heartleander81

I see.

I know from another Klipper user that he also only could get nice corners by playing around with the smooth time setting. Pressure advance alone did not help much.

Maybe extruders / hotends are so particular nowadays that we need this setting to get nice corners?

Here is the example from the user I'm talking about:

He has a bowden setup and needed to increase the smooth time in order to get nice corners. PA alone did not the trick.

@dc42
How high are the chances we might get this feature for RRF? I think this might very much help those who are having problems with PA at the moment.

@Heartleander81

So altering the smooth time value did improve your corners and PA alone did not?

@jay_s_uk

Did you already have the time to print a comparison between RRF and Klipper on your setup?

@CCS86

Yes it’s far from optimal. But at least parts are usable again. Though I had Klipper flashed and it hasn’t the flaws I’m not really into using Klipper. Just a personal preference. But wouldn’t wonder if someone switches because of that.

@gnydick

Latest official statement is that the Duet team can't reproduce the issue so I assume there won't be a fix. That's why I'm glad I found a partial fix by using Super Slicer extrusion roles:
https://forum.duet3d.com/post/298231
At the moment I'm using 0.052 PA for every role except perimeter which use 0.075 PA (PLA filament).

@gloomyandy

BulgeCheck.gcode

For Klipper itself nothing fancy.
square corner velocity = 5 mm/s
max feedrate = 350 mm/s
max acceleration = 5000 mm/s

Slicer speed settings:

@gloomyandy

Bumped PA up from 0.05 to 0.052. I think maybe 0.054 could be the optimal value.
Decreased flow a tiny bit to improve top layer quality.

(Klipper)

The result is quite comparable to what I get with RRF with "dynamic PA" (0.05 -> 0.08).
Sorry that I had to switch color. The bright green is empty after tons of testing.

@gloomyandy

I can but not for weeks as it’s quite the mess here and not really safe to print unattended.
I can print the test again with adjustments to flow and PA. I’ll post the results soon.
Inputshaping does not decrease print quality with Klipper as long you stay within the recommended acceleration settings.

@jay_s_uk

I've made a more efficient version of the model to save time and filament:

bulgecheckV2.stl

I would set the seam to rear. Otherwise it'll be at one of the corners.

@gloomyandy
Yep it's a total pain as I would need to rewire all the chains. My Klipper test was just a dirty hang all wires along the frame to the top and to the tool head method. And during the test I held the wires to they don't get caught lol.

@gloomyandy

Bottom left and top right have a small bulge.
PA was set to 0.05 which is a little bit too low. For RRF I need 0.08 to get similar results and the SuSl feature to switch between PA values whilst printing because PA 0.08 would cause defects all over the place which I'm still getting.

The hardware / printer was the same except for the tool board. Unfortunately Klipper can't communicate with the 1LC that's why I had to make a mess in my room and needed 2m of cables or so to wire up the BTT tool board.
I just wanted to rule out a hardware issue and show that is has to be somehow software related.

Things we tried or can rule out:

• extruder (I tried LGX and LDO Orbiter 2.0)
• tool board (someone tried with and without in this thread)
• nozzle (I switched from Bondtech CHT to E3D V6)
• stepper motors (I switched the motor when switching from LGX to Orbiter 2.0)
• RRF 3.3 and RRF3.4 (same results for me and others)

I have another printer (bed slinger) that's also running a Duet 3 Mini with RRF 3.4. This printer has no issues with bulging corners.
Could it be a issue with the CoreXY logic RRF uses?

Just for science. I made a huge cable mess with my printer as I flashed the machine to Klipper with a BTT toolboard and Duet 3 Mini as mainboard.

I did not really fine tune the printer so the flow is a little bit too high as you can see but the pressure advance was set to 0.05. Maybe 0.053 would be even better as the corners could use a tiny bit more BUT I don't have to use the extrusion role feature to print perimeter with 0.08 pressure advance.

Result with PA 0.05 (Klipper, same machine) without much tuning.

At least now I know it's not the machine...
Time to tidy up the machine again as this was only a test with all cables just clipped to the tool board