In a Sunlu filament spools I found a clip: it works quite well, so I redrawed it to be able to print some more. Depending on the adhesion, a brim may be required.

If you often put your spools in vacuum bags, the raised back of the clip could sometimes damage them: in this case print version 2 with the back flattened (view print profiles).

For Bambu Lab spools I advise you against using this clip, because it would be too narrow: it's better to print this specific version adapted for the larger thickness.

Warning:  before before downloading and printing SPAM profiles (uploaded everywhere always by the same users), check that when ★ 𝐅𝐚𝐬𝐭 is written it is really faster and not 30% slower at printing. Make sure also it was actually printed and that the photo used is not a copy of the print from the original profile, a rendering or a simple screenshot!