Good job, but I’m left wanting to know how to build a printer.

If a DIY plotter would do, this site has a long list of different projects

https://mattwidmann.net/notes/pen-plotters/

What if I want a cabinet sized rotating head printer that can print carbonpaper triplets, sounds a machinegun, and has LP0 ON FIRE error message

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I'd say it's an eco-friendly printer

I have had a daisy wheel printer project on the back burner for a while. They where never sold much where I live or are just very difficult to come by in usable condition. Figured it would be doable to create with a 3d printer and some simple electronics.

Inkjet is quite difficult but dot matrix printers are easier to find DIY projects of.

As far as I can remember, framework has this still on their schedule. So sooner or later you maybe can at least have a well maintainable one.

There is an open source one https://www.opentools.studio

How is that open source? There’s not a single line of code. No CAD. Nothing. Sure, there’s a “coming soon” CrowdSupply link, which I guess is more than a KickStarter. But open source?

Fair enough but I trust CrowdSupply to keep them in check. I bought quite a few projects via CS and never been disappointed. They have too much trust from the community not to follow up, it's their most important differentiator versus KickStarter and other crowdfunding platforms.

Ah sorry, I thought they were already open source. They say they will open source it once they finalize the design, but yeah, not there yet.