//+ SetFactory("OpenCASCADE"); Cylinder(1) = {-1.6, -0, 0, 2, 0, 0, 0.5, 2*Pi}; //+ Cylinder(2) = {-1.6, 0, 0, 2, 0, 0, 0.48, 2*Pi}; //+ //+ Cylinder(3) = {-1.6, 0, 0, 2, 0, 0, 0.02, 2*Pi}; //+ BooleanDifference{ Volume{1}; Delete; }{ Volume{2}; Delete; }