Duet3 6CH + 3CH expansion board - Missing steps.

Multisaft

I would like to tell u that ur not alone with this issue. My colleague and myself have exactly the same problem. Connecting xy to the expansion board and we had what u have shown on ur Youtube Video. Switching back to the Mainboard and everything is fine.

Unfortunately we need also 7 motors driven to print. Now we have the extruder on the expansion board and have the issue there.

It's nice to see that dc is working on it now especially because I have this problem since the board was officially released... It's some time now.

Fingers crossed that there is a solution soon.

Best regards.
Multisaft

dc42

@Multisaft, it's likely that the changes already made in 3.3beta will fix the issue for you. The issue I am pinning down now occurs when all of XYE are on the same expansion board and there is a very high rate of very short moves sent to the board. Even if 3.3beta doesn't fix the issue, the improved diagnostics will reveal what is going on.

Multisaft

@dc42 ty, we will try it.

dc42

Good progress today. I had been assuming that the remaining problem seen by @evomotors was caused by the expansion board firmware being too slow, so over the past few days I have been making it more efficient. But additional diagnostics reveal that it's a problem with the way the main board firmware is scheduling CAN moves. With this particular file it's sending the expansion board some moves which are impossible to execute in time. Main board firmware is easier to debug than expansion board firmware, so tracking down why shouldn't take long.

dc42

I've located the problem and tested a provisional fix. It affects systems using CAN expansion boards that have DAA enabled.

evomotors

@dc42 said in Duet3 6CH + 3CH expansion board - Missing steps.:

I've located the problem and tested a provisional fix. It affects systems using CAN expansion boards that have DAA enabled.

When and how can I test?

dc42

I've put new Duet 3 MB6HC firmware in https://www.dropbox.com/sh/wme9k0z86sytg33/AAAT6wrHp2eeJHK-dYoW1Um4a?dl=0. I expect it to work well with the EXP3HC firmware already there. I am testing with newer EXP3HC firmware, but it is still somewhat experimental.

evomotors

@dc42 said in Duet3 6CH + 3CH expansion board - Missing steps.:

I've put new Duet 3 MB6HC firmware in https://www.dropbox.com/sh/wme9k0z86sytg33/AAAT6wrHp2eeJHK-dYoW1Um4a?dl=0. I expect it to work well with the EXP3HC firmware already there. I am testing with newer EXP3HC firmware, but it is still somewhat experimental.

I started the test print with the early 3.3beta that you are posted last week and DAA disabled. Then I will upgrade to the new 6CH and try again.

evomotors

@dc42 Is it possible that pressure advance has the same issue on expansion and tool boards?

dc42

@evomotors said in Duet3 6CH + 3CH expansion board - Missing steps.:

@dc42 Is it possible that pressure advance has the same issue on expansion and tool boards?

It's not pressure advance that triggers the problem I found today, it's DAA. Pressure advance will not trigger it. I ran the section of your test file that I have been using to replicate the problem with pressure advance enabled.

evomotors

@dc42 said in Duet3 6CH + 3CH expansion board - Missing steps.:

@evomotors said in Duet3 6CH + 3CH expansion board - Missing steps.:

@dc42 Is it possible that pressure advance has the same issue on expansion and tool boards?

It's not pressure advance that triggers the problem I found today, it's DAA. Pressure advance will not trigger it. I ran the section of your test file that I have been using to replicate the problem with pressure advance enabled.

I can confirm that stuttering XY moves are gone with M593 disabled. No more layer shifts. I will still complete the print to see if issue with extrusions irregularity is gone as well.

dc42

@evomotors, thanks for your preliminary results.

I've now put the latest expansion and tool boards firmwares in that folder at https://www.dropbox.com/sh/wme9k0z86sytg33/AAAT6wrHp2eeJHK-dYoW1Um4a?dl=0. The older versions are in the "Previous-16-Jan-21" subfolder.

T3P3Tony

@evomotors Testing with your config with DAA enabled is not showing any errors on the bench setup. did you get a chance to test it on the printer?

evomotors

@T3P3Tony said in Duet3 6CH + 3CH expansion board - Missing steps.:

@evomotors Testing with your config with DAA enabled is not showing any errors on the bench setup. did you get a chance to test it on the printer?

I didn't update to latest that @dc42 uploaded. But on pervious early 3.3 betta issue stops only when DAA is disabled. And yes I'm testing life on the printer.

I will upgrade to fresh build little late today.

evomotors

@dc42 @T3P3Tony The issue is fixed in the last 3.3 build! Tested with DAA enabled and print looks great (didn't look into the diagnostic messages) . Thank you!

Do you want me to mark this as answered?

deckingman

@evomotors said in Duet3 6CH + 3CH expansion board - Missing steps.:

@dc42 @T3P3Tony The issue is fixed in the last 3.3 build! Tested with DAA enabled and print looks great (didn't look into the diagnostic messages) . Thank you!

Do you want me to mark this as answered?

I'm pleased for you that your issues have been resolved. For myself, I've given up and "mothballed" my printer.

Maybe I'll pick it up again in 6 months or so but I've been battling firmware issues and coming up with "work arounds" since July 2019 and still have problems that need more work arounds. I've had enough...........