This thing is a work in progress. It is a retaining clip for a 2002 Pontiac Grand Prix door panel. It's likely that this, or something very close to it, is used elsewhere in this and other General Motors vehicles. It is not an exact replica of the original part, which is pictured in the images. I was shooting for "good enough", and this seems to work.
I did not try to replicate the slightly concave surface of the upper (thinnest) disc on the OEM design. Seems to work well without it.
I printed this with 0.08mm layer height, 6 shells all around, and 50% infill. This is my first (published) "thing", so please comment and feel free to remix as needed.