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I don't know what the state of the art is, but 3D printing circuit boards is a thing people are doing: https://all3dp.com/1/3d-printed-circuit-boards-pcb/

I got excited but "people" here does not really refer to hobbyists I suppose (please contradict me)

My understanding is that home etching is probably still more practical and neither of those are going to match professional quality, but conductive filament and the "print everywhere except where the metal goes and then add metal" options should both be in reach of the upper end of the hobbyist sector.

It's not exactly 3d printing but Bad Obsession Motorsports took a small mill, stuck a hot end into the tool holder, fed solder instead of filament into it, and "printed" traces onto a blank PC board.

I thought it was pretty clever but they admit it was tricky to make work at all, let alone get good results.

Mobile RepRap (the ideal self-printing technology)