This simple jumpring works better than you might expect for a little piece of plastic! Easy to print in place with no supports required, just separate the small gap after printing. This is a tiny 0.5" diameter variation. I wouldn't dangle my Lambo keys from it, but it is fairly sturdy.

Relevant Short

Printing Guidelines

• Print with 4 shells/perimeters to create a solid part
• 0.16mm layer height separates easily after printing

After printing, the gaps should separate fairly easily. You may need to use your clippers to split the ends first, then the remainder of the ring should pull apart.