Almrond

Well, I would start by booting from the GRUB command line. Using the install media can work to fix the system, but this is getting into chroot territory and there is no reason to believe the system isn’t working. Just not booting. Much simpler to use the grub rescue terminal to force a boot, then run all of the grub goodness from there. Basically, if it boots from the disk in rescue it guarantees grub/efi is mounted where it needs to be, from there grub-install on its own should just work. Also, make sure the config you are feeding grub-install is set to output a boot option. When in doubt use the default config, it should work fine.

Fine, I’ll be the guy. Sounds like grub-install isn’t writing the configuration to the right place. My first check would be what grub config is being used, then work on replacing that with the one generated by grub-install.

Salmiak? It’s a licorice coated in ammonium chloride, which gives it a distinct salt/tang flavor. Probably not what they are looking for, but delicious nonetheless.

You will probably be best served with an industrial label printer, I used one while working in a grocery store to make tags. They come in toner varieties, so no thermal paper issues, and they are made to be portable. That being said, they are not at all cheap or simple. You are wanting to look into two companies, Zebra and Symbol, specifically at their mobile printers.

https://www.zebra.com/us/en/products/printers/mobile.html?page=1

To be fair, what you are asking for is nigh impossible without going thermal, and the reason can be summed up by one question: Where do you plan on putting the ink?

The problem wouldn’t be fixed even then. The jewelery companies have people convinced that the only diamonds that are worth it are mined from the earth by a real human slave. Fixing that problem has nothing to do with gemstones.