Very cool. I created a thermal printer project a few years back that prints (low quality) proxies of Magic: the Gathering cards based on the rules for "Momir Basic". It was a fun project, though formatting images to work with the various ESC/POS image formats was quite a challenge.
https://magic.wizards.com/en/formats/momir-basic https://imgur.com/gallery/momir-basic-irl-g2S3hJT
Very cool! I did a similar project with an accompanying app that connected to one of these inexpensive printers over Bluetooth in order to play a Discord, Lord of Disharmony commander deck in person.
The portability of the whole setup makes it easy to bring to an LGS, it's always a treat to see people's reactions when I pull out the printer and they see how the deck works!