I started getting random "Lost communication with MCU ‘extra_mcu’ " error during printing.
I kept checking if it is not because of overheating but toolhead temperature seems to stay between 70°C-80°C. Sometimes it happens withing first 30 minutes of the print, other times after few hours of continuous printing.
I have found this guide: How to troubleshoot "Lost communication with MCU 'extra_mcu' " | Sovol 3D Printer Wiki but the board on my SV06 ACE looks different and I do not want to mess anything up on my new printer.
The only change that I can think of since this problem started happening is me switching from printing with PLA to now printing with PETG from which I assumed possible overheating of the board on the toolhead but like I mentioned before, the temperatures seem to be fine.
Your problem is likely (~60%) the toolhead umbilical cable. It is also possible it is one of the MCU boards.
That guide you posted a link to is for the SV08. AFAIK the communication protocol (USB) and hardware is the same but you should check with Sovol support before proceeding with testing.
Yes, when I took the magnetic cover off and saw that the board is different I was like “I should ask on the forum or contact support” because I do not want to loose warranty by trying to fix it myself without proper experience. Yes from reading that guide I came to the same conclusion that It is either the board or the cable but I hoped that there will be some guide to test/fix it before I go bother technical support.
The most annoying thing about it is that the problem is random and I was not able to replicate it by moving the toolhead around the entire printing volume area which gave me an impression that the problem is more likely one of the boards instead of broken cable. One curious thing is that when I get the error, I have to totally reboot the printer so it starts printing normally again otherwise it fails even sooner. Failed 3 times in the row within 30 minutes after retrying to print the same thing and after power cycling it, it was printing for over 9 hours without problem and then when I started printing something else, the same problem until I power cycled it again and it printed without problem again.
Put in a ticket at info@sovol3d.com
Include your order number & what issues you are having.
They usually take about 2 days to answer..unless it’s on the weekend.
Just an update for anyone who has the same problem or is interested in this topic.
Support told me to check if all the connectors on the toolhead are properly seated. While I was at it, I have opened the MCU as well and pushed down all the connectors and one of them audibly clicked. Since then I did not get the error again but I was not printing much in past week so when I get more things to print to test if it was really just that one connector being loose, I’ll post an update.
