the volume of a cylinder is (pi) x (r squared) x (h) where r =
radius and h = height. unfortunately you dont say if the height is
5 or 6mm! if we take it that it is 5mm high, then- vol = 3.142 x 3
x 3 x 5 = 141.39mm if it is 6mm high, then- vol = 3.142 x 2.5 x 2.5
x 6 = 117.825mm