Filament and tube generate static electricity then cause mmu board been shock and disconnect. (Potential damage)

[willzhai55]

I noticed that when mmu loads or unloads filament, the friction can cause an electricity shock to mmu and cause it to disconnect or even stop working. The shock will happen between the tube and the encoder. My encoder stopped working after a few shocks. My solution was to ground the bearing. After this modification, the mmu has never stopped working. I was shocked when I removed the tube form ercf and realized this was the issue.

It might be because I am in Canada and the humidity is around 20%. I did two ercf with three different motherboards It will happen all the time until I ground the bearing. (Also on my voron 0.2 it will shock the filament sensor and cause the mcu to die. Even the soc in some cases. I was absolutely no ideal before and now everything is just much more stable.)

[tomlikesrocks]

Are you feeling or seeing these static shocks?
I'm in Perth Australia where our humidity is also very low, but I've never experienced a shock before.
However, I have had some disconnection issues.

[willzhai55]

I was shocked twice, it happened when I removed the tube and it was the tube that shocked me. Most of the time, The disconnect issue happens when loading or unloading the filament which the static can generate under high-speed movement. After I do the ground mod for the bearing in the encoder, I don't have disconnect issues anymore so it is a potential fix for people with disconnect issues. I am use IKEA usb-c cable for connect, the cable is a really high quality cable for a really cheap price.