? Kickstarter ?
https://www.kickstarter.com/projects/rackrobotics/powercore-cut-through-solid-metal-with-edm?ref=ksr_email_creator_launch
Dominik Meffort ??
https://hackaday.io/DerM4209
Ben Fleming ??
Applied Science video on EDM
Rick Hartley’s Proper Grounding Lecture