What does it take to make your own integrated circuits at home?
Link: https://hackaday.com/2022/03/22/old-printer-becomes-direct-laser-lithography-machine/
Discussion: https://news.ycombinator.com/item?id=37292016
Yano, that sort of repurposing done by a "cobbler" would be vital for survivors living in a post-apocalyptic world.
https://www.projectrho.com/public_html/rocket/techlevel.php#cobbler1