Tell your buddy to hybridize the two designs: a “donut” for the radial part, and an up-down mirror for the donut’s hole. You’ll have a nontrivial meshing proble

Tell your buddy to hybridize the two designs: a “donut” for the radial part, and an up-down mirror for the donut’s hole. You’ll have a nontrivial meshing problem at the interface between the two.