I have one IKEA MULIG Clothes bar that I’m not utilizing anymore, so I had this idea to convert it to a spool storage.
Remixed too parts together and adjusted the necessary sizes for the snap in clip and used a $1 Wooden Broom Handle (21mm) and the result is just what I needed.

I can easily store new filament boxes or spools without the box.

I printed with PLA a PETG would have been better as one of the clips snapped after plug it in and out multiple times (In my case it was just a crack and it was easy to fix with a drill and cable tie), also print with support