I am part way through building my mpcnc plasma. If I have to much trouble with EMI I will switch it over to a router. I started making a youtube channel that covers the build with hopes of helping other new people like myself. I probably would not of done this but I broke my back 5 months ago and I was going stir crazy, and a cnc plasma might be fun if I ever keep going on my 55 Chevy build. So far I have only gotten as far as assembling the machine on the table and loading marlin on the arduino.