If someone is looking for a way to print cards or labels, you can take a look at my project labelmaker:

https://pilabor.com/projects/labelmaker/

It is designed to create PDFs for a music / audio book collection. The article contains also links to other projects following the RFID approach.

Another interesting possibility is to use small wooden cards with sticker labels (which I use for my daughter to NOT use these plastic / PVC stuff) or even glass, looks awesome but is also more expensive.