My new Raspberry Pi for the birdfeeder camera arrived and I already set it up! It replaces an ODroid XU4.
This upgrade will hopefully allow me to bump the video resolution from 480p to 1080p, which should give us significantly more high-res insights into the appetite of the local wildlife.
Also, hopefully this setup will turn out to be more stable; right now the Odroid keeps hitting some form of power/thermal limits and going into reboot loops from things as simple as running rsync or journalctl.
Heating up the remains of the brass tube with the soldering iron seems to have done the job; I did not end up melting the peek insulator as I was afraid I would.
With the casualty of only one fixing pin from trying to get the remaining plastic out, the 3D printer appears to work again now — and use M6 threaded nozzles rather than M6*0.75, which gives me more options for nozzles.