Guidelines Keychain Custom NFC:

Slice the project, if you have AMS you don't have to worry about changing any parameter otherwise if you want the writing of a second color you will have to change the "color change" with the "Pause" command.

Start printing until it automatically pauses. it's time to insert the NFC tag inside the keychain.

Continue printing until finished.

I bought 50 NFC TAGs on amazon Spending about 12€

50 Natg215 NFC Tag NFC Card NFC Programmabili NTAG215 Carte NFC Riscrivibili Business Card NFC, 504 Byte di Memoria,Compatibile con Amiibo Tagmo-TimesKey : Amazon.it: Altro