I like these clips and use them daily on 20 some spools.
I found them to be a little loose in the “original” (ie, V2) design so I remixed tiny details and made them work as a spring when installed.
I print my from TPU+ and orange for high visibility. Makes swapping spools go more smoothly!
(0.4 nozzle, 0.12 layers)
The author remixed this model.
Hardly distinguishable at first glance …
The main feature is that I added a small bump to the middle of the clip to keep the filament under load, to keep the whole thing more secure when installed.
I also rebuilt the pegs from scratch to make the fit thru the spool holes tighter as well as the filament thru the pegs. Tightened the clearances by 0.10 or less mm so it really comes down to the slicer, printer, filament, and calibration in the end!
I think @Kevin_1268061 actually had made these things looser intentionally, but I was having too much slippage on my spool collection.