[rottndog]

That's just a more modern and precise form of stereo lithography that has been around awhile.

[NicknamedBob]

Stereo lithography marries up well with lost-wax castings. However, EM can carve directly on the metal. Basically, this gives the difference between a cast part and billet machining. Required strength can be the determining factor.

Now let us speculate about how accurately EM could produce a plate for manufacturing currency. And then calculate how long it would take, at a minute per square nanometer.