I looked at all of the RFID adapters out there and there were two common things I noticed. Either you had to print an adapter for every different spool you have. Or you had a single base part that had different attachments to accomodate different spools. I just wanted one adapter that I could use with all the different spools I have.

After several iterations, I ended up with this model. The two halves are connect via a rubber band ( i used two per bracket) and there is a place to put the RFID tag. There is a cover for the RFID pocket if you don't want to actually stick the rfid tag onto the bracket. You may have to adjust the Y and X dimensions of the RFID cover depending on your printer settings.

I fashioned a paper clip to make it easier to attach the rubber bands. Refer to the pictures to get an idea of the process I used.

This is the program I use for the RFID tags and amazon links for the rubber bands and the RFID tags themselves.

RFIC for CFS - Note sure if it's available for Apple 

Mifare RFID Tags

Mini Rubber Bands

I hope this model works for you, or gives you an idea on making one for your purposes. Please post your makes and give me a like if this model helps you. Message me if you have any questions.

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RFID Spool Adapter - Universal

0.2mm layer, 3 walls, 15% infill

0.2mm layer, 3 walls, 15% infill

0.2mm layer, 2 walls, 15% infill