I found myself oftenly printing keychains, but not having actual chains to put them on. Since I didn't really like the chain models I found on Printables and Thingiverse, I decided to simply make my own (even though I am very much an amateur at 3D modeling)

It doesn't require supports (brim is reccomended if you have adhesion issues like me, they can be bit tricky remove though and it might take some time)

I'll leave all files you'll need to make it as long as you want