Point(1) = {0, 0, 0, 1.0}; Point(2) = {10, 0, 0, 1.0}; Point(3) = {10, 10, 0, 1.0}; Point(4) = {0, 10, 0, 1.0}; Line(1) = {2, 3}; Line(2) = {3, 4}; Line(3) = {1, 4}; Line(4) = {1, 2}; Line Loop(5) = {1, 2, -3, 4}; Plane Surface(6) = {5}; Extrude {0, 0, 2} { Surface{6}; }