The invention relates to a device for casting a ring-shaped plastic frame. The device includes a first mold part and a second mold part, a rotor having at least one recess, and a mold core. The mold core includes at least one casting channel configured to connect to a supply one end. The mold parts may also include at least one mold insert. The mold volume is at least partially defined by the at least one mold insert, the at least one recess of the rotor, and the mold core. The mold volume is fluidly connected to the other end of the at least one casting channel.