V3DPrinting

I had the issue with FW 5.X on my two UM3X with auto leveling frequency set to Always. Changing the leveling frequency did nothing to the issue, except turning it off and doing a manual leveling (but it is tricky as it is temperature dependent) The only workaround for me was to downgrade to FW 4.3.3. Since no more issues with dual extrusion prints.

Hi John The issue is determining the right nozzle height for the 2nd (right) nozzle. Both left and right are using the capacitive sensor to do it and left nozzle is always fine. To me the issue is more a computation bug in the FW. Nevertheless the sensing cycle on 5.2.x seems to be more accurate due to the fact it is heating the build plate, taking into account its thermal expansion. Unfortunately, it's not operational on UM3.

Hi John I do confirm that FW 4.3.3 fixes the issue on UM3X. Works like a charm since May 2020. I haven't tested the latest FW, as Ultimaker does not put any penny in the UM3. Everything is focused on S line, and their non regression tests are nearly non existent.

I am still using Cura 4.2.1 because I had no disconnections over ethernet on my S5. Also I haven't upgraded the FW, still 5.2.11. But I was thinking of an upgrade. In my case disconnections were linked to the creation of a bunch of "shadow" printers by Cura 4.3, 4.4 and 4.5 (all were a PITA regarding this weird behavior). Printer were visible in the printer management tool, but not connected except one. That was messing up the connection. Is that your case? I had some calls with Ultimaker Team, but they were saying not to be able to reproduce the problem....

Have you checked your machine is perfectly grounded ? No issues with your mains ground ? Have you checked and calibrated the lift switch ? Are your print cores perfectly seated when loaded into the printhead ? If everything else is OK, PCB in the printhead might be faulty or the sensor board.

Maybe you have another machine too close making EMI ? Or it's the PCB ... Ask @gr5, he's the expert.

Is the print core 1 touches the build plate when doing the active bed leveling ? If not, maybe a PCB issue. The one in the printhead.

My BCN3D Epsilon has arrived and will be production ready today. Having some free capacity on one of my UM3E, I have downgraded to 4.3.3. So far, for the first dual extrusion print, my 2 printcores (both 3d Solex Hardcores) are leveled at the same height. So the problem was FW 5.2.11 on UM3E I will downgrade my other 4.3.3 too over the weekend. And not going to upgrade anymore. Again poor non regression tests from the Ultimaker FW team. Thumbs down !

Also having all my Ultimaker printers wired and the S5 host with 2 UM3E slaves. With Cura 4,3 and above, the S5 disconnects frequently from Cura. This may lead to many instances of the networked printer created in the Printers list. Since I've downgraded to Cura 4.2.1 not any single disconnection from Cura. Regarding the disconnection from the web page, I haven't noticed it under macOS 10.14 and Safari, even with Little Snitch

Hi @maht Sure we should have a video call. I am pretty busy with COVID products, but we can manage to make 30 min video call this afternoon after 15.00. Send me a PM with the link.

@ghostkeeper I am not sure, still have the issue with 4.6.1 see my post on GitHub I do not agree at all ! It was perfectly working without ANY disconnection on 4.2.1 see my post from January. In addition, my hardware (printers, firmware, network) is exactly the same with 5.2.11 FW, LAN connection, same Ultimaker cluster. And it's not a WIFI issue as all my printers are wired. The problem is there since 4.3 release. I have just downgraded to Cura 4.2.1 end of the morning, since no more disconnections. Also the networke

@ghostkeeper I have upgraded to 4.6.1, but the same bugs are still there : - material are not loaded properly opening a project (GitHub issue #6626) - some materials cannot be removed (GitHub issue #6731) - disconnections - messing up with the networked printer 4.5 and later have optimized tool path compared to 4.2.1, which is stable, that's why I'm not downgrading a second time. So please fix the bugs !

I hadn't the opportunity to downgrade before the lockdown in France. Since, I'm busy printing COVID parts in single extrusion where there is not leveling issues. I'm expecting a new printer next week and hope to have some slots end of the month to do the downgrade

@ghostkeeper` Any update on these issues. On top of them I also have multiple disconnections with Cura 4.5 and strange behavior regarding the networked printer management. It might be linked with this issue, due to shadow printers not properly purged when uploading a project. See the screenshots. I don't have any logs nor time to explain more. Just have a look at the screenshots. After a disconnection I had this message Trying to reconnect I had the following Weird isn't it ? Another bloody bug in Cura 4.5 !

I do confirm that this wrong behavior / Bug is present on 4.5 and happens when loading a project based on a different printer than the previous one.