To avoid this, all you have to do is add a ‘phantom’ gap that forces z-suite to construct perimeter material (for vertical gaps) or solid fill material (for horizontal gaps) rather than infill material. I use the term phantom because z-suite can see it, but in reality, the gap is so small the additional layers just fuse together as if there were no gap. Use the same rules as normal i.e. wall thicknesses of 0.8mm allow space for 2 perimeters.
As you can see below, I’ve forced Z-suite to produce 6 perimeters around the holes to prevent crushing by adding cylindrical gaps around the holes in the CAD model. You can add as may perimeters as you want, just by adding more phantom gaps.
Using this technique you can add solid material or extra perimeters anywhere you want in an otherwise low-density infill model.
I’ve only just started doing this on models with 0.14mm layer heights but it works really well and I imagine that the other layer heights will also work well, but you may have to tweak the gaps and wall thicknesses to get the best results. I can now create production models where you can torque up fixings as much as you want without worrying about crushing your model. Adding extra perimeters to the outside surface can be added using the same technique.