Currently, when exporting a PCB object, it is pretty much useless for importing it into a CAD program because of it's size (80mb+ for my simple file). I used to be able to disable all majorly contributing fine elements (nets, pads, fills and circles) and this would produce wonderfully small stl files that would work somewhat well with CAD software. However, now when I enable that same rule, I get an error and the app crashes, both in the 2D and 3D view. My rule is called "disable details", you can check it in the project link below.