Comment by kiliankoe

It's come up every time something related to thermal printing has been mentioned on HN lately, but this is honestly great stuff if you're in Germany: https://www.oekobon.de/

These non-poisonous blue receipts have the added benefit of being able to be marked with a fingernail, which is nifty if you're using them to print your shopping list, crossing things off is very satisfying.