C-Clip as a spare part.
Used to attach brake lines and shift cables on bicycles.
Unfortunately, they're so small that they often get lost when removed. Can be purchased as a spare part, but at a disproportionately high price.
Made of PETG, the self-printed replacement should be durable enough.
On a normal print bed fit umpteen of these clips at the same time - enough for you and all your acquaintances ;-)
The author marked this model as their own original creation.