In the 1970s to 1990s, modern computing got its start in people's garages. Now, modern experimenters are creating 1970s to 1990s-era hardware in their garages.
Which inspires the thought that the original 68000 CPU used in some of the Commodore Amiga line of computers was fabricated on a process node with a feature size merely 3.5 microns (or 0.0035 millimetres) across - A feature size well within the theoretical grasp of current commercial 3D printer technology.
Of course, there are a number of potential legal problems, and I Am Not A Lawyer. I merely find it amusing to speculate on such possibilities. And, if demand is sufficient, some industry comparable to print-on-demand reprints of old books might occur - Print-on-demand of old computer parts. Largely, I think, the same impulses would drive this theoretical sales model; a desire to have that income directed to the IP owner, rather than someone selling a used copy; as well as to increase the repute of the company by supplying modern higher-quality reproductions. And, as modern print-on-demand books can exceed the physical quality of the original, a modern print-on-demand copy of some piece of retro hardware could also exceed the physical quality of the original.