  In this note we consider the problem of manufacturing a convex polyhedral
object via casting. We consider a generalization of the sand casting process
where the object is manufactured by gluing together two identical faces of
parts cast with a single piece mold. In this model we show that the class of
convex polyhedra which can be enclosed between two concentric spheres of the
ratio of their radii less than 1.07 cannot be manufactured using only two cast
parts.
