Earlier this year [Skyhawkson] got ahold of an Apollo-era printed circuit board which he believes was used in a NASA test stand. He took high quality photos of both sides of the board and ...

The base layer is printed in regular (non-conductive ... resulting in a pretty good-looking 3D-printed circuit board whose conductors feature actual metal. [hobochild] used conductive filament ...

Conventionally, semi-cured PCB layers are held in cool ... More information: Zhihan Zhang et al, Recyclable vitrimer-based printed circuit boards for sustainable electronics, Nature Sustainability ...