Creality K2 Plus/CFS RFID Tag Adapters for Sunlu Filament

A simple and easy to print tab that snaps onto Sunlu filament spools to securely hold RFID tags in the correct position for the Creality Filament System (CFS) to read.

I am using this legend from Reddit's android app to write my own RFID tags. 

I am also very eagerly following this other redditors progression to get custom profiles to the slicer/printer from the RFID tags.

Usage:

• Each spool needs a thin and wide tab printed.
• Attach RFID tags to tabs (One on each side, must be identical, must be Mifare Classic 1k tags, I am using these ones reliably.)
• Pick which CFS lane you're going to use
• Orientate the spool and check which side the Thin and Wide tabs need to go (One side of each CFS lane has more room than the other and they alternate, see below image)

Installation:

They fit best with the semi-circle aligned with the centre of the spool and centred between the 2 large holes on the spool that you'd use to check remaining filament. Hard to explain, just look at the pictures.
 

Tabs can be hard to push in, but that's intentional, if you're struggling just wiggle them sideways whilst applying force. 

Versions:
There are 3 versions with different clearances for the posts to fit into the filament spool.

3.3mm

3.2mm

3.1mm

I typically use 3.3mm but found sometimes it can be a bit tight, so I have included the others.  Just print one of each and see which is the best fit for your printer.  The goal is to have a solid press fit so they won't come out during a print.

I printed in PETG with 0.4mm nozzle at 0.2mm layer height and 25% infill (Gyroid).