Rotating element of a printing machine with a ball

Rotating body (01) for a printing press comprises a roll body having at least one channel for a temperature control medium with at least one inlet (08) and one outlet (09). The temperature control medium exchanges with the roll body a quantity of heat along a path between the inlet and the outlet. The roll body has a base body (17) and an outer body surrounding the base body. The channel opens toward the inner side of the outer body. An insert thermally insulating the temperature control medium from the base body is arranged in the channel at least along the path. Independent claims are also included for alternative rotating bodies. Preferred Features: The insert consists of a thermally insulating material that is a synthetic resin and contains hollow glass bodies.