My little kids folding lawn chair was missing the plastic caps for the feet, so the chair would sink into the ground. So, of course, this called out for a replacement printed on my Thing-o-matic in just a few minutes. This is designed specifically for the smallish 13.6mm diameter metal chair legs....probably not a standard size. If I knew more, I could make it parametric or customizable in size, but for now, the downloadable STL is specific to this leg size.Printed out with 1 extra shell and 100% fill since it is a structural part. Print out and hammer onto the chair leg. Fixed!