I was interested in electrochemical 3D printing awhile back: 1. Deposition can be very precise (they say micron-level resolution here), but it's typically slow

I was interested in electrochemical 3D printing awhile back: 1. Deposition can be very precise (they say micron-level resolution here), but it's typically slow for a naive approach. That's not necessarily a problem if you need that precision. They say their approach is fast, probably by using some kind of array of nozzles (think an inkjet printer head). 2. You can also selectively run the process in reverse, so an electrochemical printer is actually a combo additive and subtractive manufacturing machine. 3. Because it's electrochemistry, I believe such a 3D printer is mostly restricted to depositing pure elemental metals and only a few alloys. This severely restricts your material selections. Very cool to see this commercialized though, I'm curious how far they can take it.