Miniature spool as fridge magnet, can also be used as filament swatch.
The assembly is shown in the picture, glue is recommended.
The Spools are ~20x6,5mm and the required Magnet dimension is 8x2 mm.
I recommend a little glue for the assembly.
My suggestion is to print a bunch of the spool parts and print the “filament” every time you start a new spool ;).
The author marked this model as their own original creation.