This is a generic project foot design based on the feet used on Marshall cabinets. It is fully parametric, so the size and the holes can be adjusted. The round edge will automatically adjust to the params. I'd suggest to print it with extra shell and bottom layers and good infill if you want to put some weight on it. I can imagine it would also work quite well with flexi PLA or ABS for shock absorbtion.I also added an .stl file for folks who don't use OpenScad. It has the exact size of my Marshall cabinet feet, but I don't know if all series have the same size feet.