I think that 3D printing never picked up, because it's one of those things that empower the people, i.e. to repair stuff or build their own things, so the number of opportunities to grift seems to be smaller (although I'm probably underestimating it).
Most of the recently hyped technologies had goals that were exact opposites of empowering the masses.
A lot of it is, but let's agree that using "prior" is just fucking pretentious