I ordered a bunch of metal business card blanks off Amazon this week. I hoped they would be thick enough to electroengrave, but they are way to thin for that. They do engrave nicely on the Glowforge though. This is 1000/80 340lpi.
I have purchased the materials to do a direct photo emulsion onto thicker aluminum plate, and I should have the materials together to do that this week. That process won’t involve the Glowforge though.
Here’s the stock I ordered.