In the late 40's Florence Knoll hired a metal sculptor named Harry Bertoia and gave him a workshop, and asked him to make whatever he wanted. The result of this experiment was a series of modern chairs which are said to be "made mostly of air".
These models include the iconic, flowing wireframe Bertoia Diamond Chair, Bird Chair, and ottoman.
Newer models of these chairs have holes drilled in the bottom of the leg runners to accept push-in plastic feet. My thrift-store diamond chair came to me with 3 of these 4 feet, and the remaining ones were pretty beat-up. In order to complete the restoration, I intend to print four new ones from ABS. I modeled this foot/glide in Fusion from one of the beat-up originals.
I haven't printed this yet! If you print them, please let me know how they work! If you need to modify them to fit, tell me about it!