I love CB4D's Microlab - Mini Modular Home Server Rack.
It comes with a "Feet-Edge.stl", but I wanted a slightly thicker foot so it wouldn't sink into my carpet. So I modelled one.
It's an easy print without supports.
I used OnShape to sketch it out.
https://www.printables.com/model/1221112-microlab-thick-foot
CC BY 4.0
Original author CB4D. Remix by Leon Brocard acme@astray.com