Trammel of Archimedes (Ellipsograph/"Do Nothing Machine")

I was looking at mechanical devices to apply to my Tectonic game and I like the function of the Trammel of Archimedes (also called an Ellipsograph). These are often posted as "Do Nothing Machines", but it is a misnomer. It's a device to create an elliptical shape. I made several of these for various trials, there is no benefit to additional legs as far as I could tell. Warning: this is not a clean listing of parts. I tried and printed several iterations before moving on to try it for Tectonic.