I purchased my first SV08 four or five months ago, I have had on going problems with the tool head board loosing connection or just going faulty! I have replaced the board and cabling and that cures the problem but the problems recurs. This must be either poor quality cabling or PCB boards? I unfortunate purchased a new SV08 and within tree days the old familiar problems has shown up on the new printer!!! The tool head has lost communications with the motherboard, this problem I know has shown up numerous tomes on the Sovol SV08 forum, this one problem must be coasting Sovol big bucks but the mew parts at least to me seem the same as the original problem ones? Please SOVOL get on top of these problems, have your quality control team get these problems sorted once and for all. You have the potential of having a top quality printer and it is falling short because of these sort of problems.
I hope that Sovol top management reads this and implements changes to take place.
Kindest regards Mike Irish.
Weāre so sorry for the bad experience. We will feedback your advice. About printer problem, please send the e-mail to info@sovol3d.com. The customer service personnel will help to solve your probelm.
Have you tried snapping an old ferrite core from a power cable or VGA cable around the cabling to the toolhead ?
Might do the trick
I have fitted them in the toolhead cabels an the 7in BTT Screen + the power lead. So I think I am well SUPPRESSED 
Iām guessing youāre talking about the infamous āError 8-ā Mainsail Error Message Containing āextra_mcuā that plagues the Sovol SV08 where a print is going fine and just stops in the print with no possibility of resuming. Iāve tried the ferrite cores. Iāve checked connections on the toolhead, etc. Put new toolhead circuit boards. All do nothing to correct the issue. Iām now trying Joel Tellingās fix related to the fact Sovol installs Obico by default and it is the cause. 15 hours into a print and with fingers crossed hoping I donāt get another āerror 8ā.
Update: One print finished. A second print quit after 7 hours with the too familiar āerror 8ā. Out of the nine different 3d printers I own this SV08 is the only one I regret buying.
Why not publish help here in the forum, so that other users can benefit from your solution too?
After searching around to various solutions, bypassing the filament runout sensor seems to be the only solution that worked for me. Not that the sensor is bad, but that some filaments cause static electricity when room humidity is low. I was able to force an error 8 several times by walking across the floor and touching the screen, or sometimes the metal frame. Sovol mentions in the troubleshooting to ābe sure filament runout sensor is not causing staticā.
This was not happening when the room humidity was above 30% so I think Iāll continue to bypass the sensor anytime it is below 30%.
I worked in the automotive industry and static electricity was something that we had to deal with upon occasion.
The first instance was the guys getting zapped when installing the steering wheel with the airbag. The operator would slide onto the seat in the car, and charge themselves up. Attaching the steering wheel would provide a ground path and a Zap! to the installer. We were concerned with airbags going off during installation (which never happened). Needless to say this had to be dealt with.
The other was the static-cling wrap machine that was elevating itself to 80k volts while unwinding in the winter. The operators got to where they refused to run the machine (And I canāt say as I blamed them).
Both of these issues were dealt with by adding, or improving the grounding of the equipment.
This can be done with the Sovol by putting a piece of copper tubing after the runout sensor before the Bowden tube and bonding it to the frame with a piece of copper wire.
Thanks,
John