The gömböc is the first known physical example of a class of convex three-dimensional homogeneous bodies, called mono-monostatic, which, when resting on a flat surface have just one stable and one unstable point of equilibrium.
It is printed in two symmetrical halves, cyanoacrylate is needed to join the two parts together. Be careful with this step because it may cause it to not work. It cannot be printed on a single piece because the use of supports means that it does not have the perfect geometry.
It is not possible to place the Gömböc in any position other than with the sharp side facing up.