Trouble with selectors

[geiseri]

Hi, I am struggling with trying to select a face on an object so I can create a workplane. In my case I have a box as below:

I get the face I want with the selector case_bottom.faces("<X[1]"), but what I really want is to get the "<X" axis face with one edge on ">Z".

Now I might be going about this wrong. I am putting a "snap fit" on that face, so later on my selector no longer works since the "<X" indices have changed. Any advice here? Thanks!

[jmwright]

@geiseri I'm not sure what you mean by a "snap fit" in this context. Are you adding a ridge or detent or something like that?

If you can share your full code, or at least more of it, it might be easier to help.

[geiseri]

By "snapfit" I have two surfaces that overlap, one side with a groove and the other with bump that is small enough to slide over and when the two parts line up the bump secures it in the groove. In oscad I created a cylinder and cut it out of one side and unioned on the other one. Does that make sense?