I find it quite hilarious how people who look quite sensible and not stupid at all, at the same time think "3D printing" as a very high-level concept being able to just magically "print" anything, including food, IC wafers if not even drinking water from electrons, neutrons and protons, and they think that the sudden availability of plastic-extruding printers somehow is a "proof of concept" that proves the same revolution somehow will happen as easily on printing anything.
This is quite some magical thinking.
To me, it's completely clear that extruding some melted plastic with a few stepper motors is utterly trivial, that part was no problem in 1950's. What actually happened in 2000's were the quick advances in semiconductors, not forgetting software efforts, allowing a cheap home computer to run complex and capable 3D CAD programs and make them more user-friendly as well, so that proper models can be created and sliced for those utterly trivial 3D printers to print.
But the key is, plastic is easy to extrude. You can simulate it with a hot melt glue gun with only an order of magnitude inferior precision. ICs are not that easy to manufacture, and not even close. There simply is no connection from melting plastic to making chips.