Can I pick a single contour to machine from an imported STL file?
Have not found anyway to manipulate STL files other than the ones you use for setting it up, I would love to be able to drop a no depth pocket over parts of some STP’s but even that is not possible.
Can you share anything? Perhaps the the STL or a photo? It sounds like you want to extract a 2D image from a cross section of the STL at a particular height.
Imagine the St. Louis arch. I want to carve multiple arches where the high point is in the Z axis.