Director's Chair D shaped feet

My director's chair usually mires into the sand while watching the rocket launches across the Indian River (in FL) so I decided to 3d print some wider feet for it. I made a slip on foot for each leg and found that the round feet caused a problem when the chair was folded up. So I chopped off one side of the circle and printed another set.

the 3MF file makes 4 feet with the extra strength 6 walls options set.

The feet will fit a metal chair leg that's 15mm x 29mm

I used white PLA and it's plenty strong and will probably outlast the chair.