This is my take on similar CNC machined feet for Tex 60% mechanical keyboard cases. You will need to add some supports if you choose to print the smaller radius step on the bottom of the foot. Otherwise, you can adjust the object -1mm on the z axis ("Cut off object bottom"
in Cura... not sure about other software)

I'd recommend 25% or more infill and 2 shells. I used some leftover 3M 468MP adhesive sheet to affix them to the bottom of my aluminum case that was never drilled for feet. Remixes and improvements are welcome. If I remember, I'll upload the OpenSCAD file too.