A few days ago I send the STL files for the superconducting magrid to Prometal for fabrication. They are having problems with my STL files – overlapping triangles; the red area will not clean up:
I have no idea how to fix this.
UPDATE:
Spoke with Mike at Prometal. He suggests trying again with higher resolution triangles. I’ll do that today.
Prometheus Fusion Perfection 
Turns out the problem was an error in my BRL-CAD model. Basically I had regions within regions, when I needed one region at the top composed of combinations.