This is a foot I print out of 95A TPU to protect furniture and other surfaces from the bottom of my PETG prints. These are commonly called furniture feet. I was purchasing something similar, but they are actually pretty expensive. With these you can add a washer and machine screw or a washer and metal/wood screw depending on what you are connecting these to. I usually put a nut inside the

I print standard Bambu Generic TPU settings, big side down. No supports are necessary.
The foot as is is @ 10mm tall, 24mm at the largest part of the circle and 20 at the smallest. The hole is 10mm across with a 4mm hole in the center the entire way through.