hull() { circle($fn = 0, $fa = 5, $fs = 0.5, r = 2.3); group() { multmatrix([[1, 0, 0, 0], [0, 1, 0, 1.15], [0, 0, 1, 0], [0, 0, 0, 1]]) { square(size = [1.90538, 2.3], center = true); } } }