Pieds pour appareils a rails.

thingiverse

Here are some printable feet made to go under CRC / Schlumberger instruments which have metallic rails instead of feet. These feet fit themselves inside the rails and stay firmly in place. They can be used straight out of the printer, or combined with rubber or felt feet. The hex cut on top is designed to receive an M4 nut, allowing you to screw in rubber feet that require this specific thread size.