So I created two spheres following the procedure on the attached document, reason for two spheres was to use the subtraction feature in tools to make the sphere hollow, i.e. empty sphere rather than a solid one. The problems I am having is that one face remain when I try to vertically translate the sphere, and I get a mesh error when I finally manage to make that face disappear. I have attached a screenshot with the error I am getting, the document used to draw the spheres and also my model simulations. Please help me.
<?xml version="1.0" encoding="UTF-8"?>
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