They're not great for anything that might produce heat. Seeing a MOSFET slowly starting to imitate the Tower of Pisa after dissipating a measly 1 W for a few moments was a sight to behold.

For about two seconds before I cut the power.

CO2 emissions from burning wood (and charcoal) can considered net-zero by some (I'm not really interested in arguing one way or the other) because all of the CO2 being released was initially trapped out of the air by the plant, not releasing "new" carbon that was initially trapped underground

It's an art project

That's a cool project, I've actually considered something somewhere but never put the energy into actually doing the work.

I'm guessing that the issue here might have been that copper as a metal is kind of difficult to trace the source to ethically?

Also, with this method each 3D print is a new instance of using plastic, where with clay you only use plastic once

Wood fired are CO2 neutral (but a problem of pollution with fine particulate at scale in poorly ventilated valleys).

That link sounds interesting but I can't open it :(