As many of us may be already using 3D printers and/or even using 120 VAC sourced power supplies for our battery chargers, the following is a case when some one got shocked while using a 3D printer.
https://www.youtube.com/watch?v=v1OuYg7AJjw
The proper explanation can be found here.
https://www.youtube.com/watch?v=3jYZDLOV4Jc
Hope this will contribute to having a safe working bench.
Yikes! 94 volts leakage! Good post Carlos. Grounding is very important!
Thanks for sharing.
Andy