Probably one of my most printed objects. So far for me everything works flawlessly. I'm using the RFID-Friend Slix-L tags too and did not experience the problems mentioned before. (edited)
Magnetic RFID tag
Makes
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Great print! For the SLIX-L tags I use (from RFIDFriend), the base seems to be too thin. I need to have ~1mm more between tag and Toniebox in order for it to be recognized. Did you experience similar issues?