Hi rastermind2,
Thanks for the feedback.
I hope the provided material allows for something you can work with.
I worked more on the XPresso-based file 😉
I put a request in to have that three points in space into a connecting Circle.
With the three single-axis rotation arms, we get a triangle in space, which could be expressed with a radius-changing circle. Below that circle is in its middle point perpendicular down the moving object (printing or operating head), as the three "legs" are fixed in length.
Enjoy your project
P.S.: here is a newer version (2024/11/09) Simpler
cv4_2024_drs_23_xpar_11.c4d