Using the holes in the spool to fix the filament while not in use puts the filament under stress and it tends to break after a while, these clips prevent that from happening.
Compatible with the AMS on both sides of the spool.
I would still recommend only using the right side of the spool in the AMS or glueing the clip in place so it cannot fall out and block the spool on the left side.
The design is completely parametric in case you need to fine-tune the fitment, just open the source file in Fusion360 and adjust the user parameters.
Made with the personal version of Autodesk Fusion 360 therefore non commercial only.
Source file included.