The model is not subdivided at all, which is probably where Nomad is finding difficulty. I could only keep the edges sharp by ticking the experimental “Keep topology on import” in the Display settings - the tooltip says to use this to stop Nomad from fiddling with the geometry so I thought I’d give it a go. It works but not when you open the saved file without choosing keep topology (even though it’s not importing that time, it;’s just opening the saved Nomad file format).
I couldn’t get the model to sub-divide sharp enough to look good, which is why I had the idea to try the “experimental” import setting. The problem is really that you can’t leave the box ticked for that setting as it is not saved when Nomad is closed.