It's pretty much moving atoms in two-dimensions only (essentially pushing them on a surface with a tiny needle). And it's painstaking--you certainly couldn't ma

It's pretty much moving atoms in two-dimensions only (essentially pushing them on a surface with a tiny needle). And it's painstaking--you certainly couldn't make anything on the macroscopic scale. I doubt even nanobots are feasible (how would they work?). Also, in the case of e.g. the 3D Sierpinksi triangle there'd be structural issues (the voids would be fill with something), and you'd be up against entropy (there would be defects, so I'm not sure if it wouldn't just collapse) so it's really not much more than a thought experiment at this time. And, ultimately, what would be the point? Unless you can get novel electronic or mechanical effects etc. I'm not sure it'd be worth it.