I am trying to print an art asset sculpted with multiple meshes. It does not respond well to remeshing but tests using Union Overlapping Volumes look good. I also want to embed geometry created in CAD as a negative, but when I try to boolean the objects by adding a cutting mesh (set to 0 walls, 0 top, 0 bottom, 0 infill) the sculpt object slices as though the required union setting wasn't checked.
Checking Union Overlapping Volumes in the cutting layer as well had no effect. I tried the infill subtraction mode also just for troubleshooting purposes and it does seem to function as expected (although it does not do what I need, obviously).
If anybody has a clever solution I'm all ears, been up all night failing to solve this puzzle. The original file is somewhat cumbersome, so here is a simple test setup.
bugreport_subtracting_object.obj
bugreport_composite_object.obj