Here is a cardboard spool RFID adapter for the CFS.

Tested and used for more than 40 hours without issue!

This will work with all standard mifare 1k rfid tags.

Currently tested and working according to the following:

Polymaker Polyterra,

Creality hyper PLA spools

Partial compatibility (may require scale adjustments depending on machine) :

Creality cr pla (plastic spool)

Just Maker cardboard spool (works but is very tight use 6.9mm insert)

Elegoo PETG spools (works but is very tight and hole needs to be expanded use 6.9mm insert)

wide hole spools

Does not currently work with:

sunlu PLA reuseable spools

update:

added new 6.9mm solid inserts to work with tighter spools

added solid insert with original 7.5mm insert size for additional strength

Added new wide option created by AJ Jensen on facebook. should work with wider holed spools

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I would recommend printing these in PETG as pla can snap on install.

100% infill (should be this by default)

.2 layer height,

standard profile, no supports

Always test fit these on the spool before sticking the tags on

RFID for CFS adapter