This is really cool. I used to enjoy toying with thermal printers until I found out the paper is coated with a very fine dust of BPA. Still they sell thermal printer cameras on Amazon marketed for children
The fact that they make a loud noise every time an order comes through is useful for a restaurant kitchen, too.
The Epson TM-U220 is one model to consider.
https://www.epa.gov/sciencematters/are-bpa-substitutes-any-s...
The alternative chemicals for thermal paper are totally different. That's not to say that they are guaranteed safe, but that study is inapplicable.
E.g. one type of paper claims to use Ascorbic Acid (vitamin C). No idea what else is in it of course, but it's not a BGA-analogue plasticizer.
How would you know it doesn't, if you don't know what's in it?
Regardless, my point is that many BPA-analogue containing products advertise their BPA-free status.
Or, there are apparently at-home testing chemicals that look simple to use. I haven't done it myself though.
I do get the impression companies are beginning to move back to traditional printed receipts, at least a bit, here in the UK.