Mates you made my day... i used my printer for about 3 months now stand alone and considered it absolutely safe. Since it is my third one i wanted to sell it and show the friend how to use it. Hooked up on USB... boom. The inductor blew up initially. Also it killed 3 of the steppers. I thought the board might be faulty so i hooked up my well loved MKS Sbase 32 bit... you can imagine what happened then. If i might meet one of sunhokey i would slap him to death. I fixed the insulation with 3 sheets of kapton and applied shorter screws. Also i shorted the blown up component. I will observe the printer for a month now, before i let it print unspectated! This issue is for sure the worst thing i have ever seen.