I was originally going to reply and also point out Microwaves as well, but while double checking that my memory served me correct, I discovered that 3d metal pr

I was originally going to reply and also point out Microwaves as well, but while double checking that my memory served me correct, I discovered that 3d metal printing can be a use for electron guns as well [1]. Heck that can possibly involve Vacuums and metal powder as well... good times! [1] https://en.wikipedia.org/wiki/Electron-beam_additive_manufacturing https://en.wikipedia.org/wiki/Electron-beam_additive_manufac...