In some examples, a carriage for a printing system includes a printhead, a conduit to carry a cooling airflow to the printhead, a return chamber to receive a heated exhaust airflow produced from heating of the cooling airflow by the printhead, and a seal between the printhead and the return chamber to prevent the heated airflow from flowing to a location below the printhead.

A heating device to heat a molding face, particularly a large molding face. The heating device includes a metal sheet having a ferromagnetic layer, and a part formed into a shape that defines the molding face and a forming plane. A base of the heating device supports the metal sheet. An inductor of the heating device provides the induction heating of the metal sheet.

A heating device to heat a molding face, particularly a large molding face. The heating device includes a metal sheet having a ferromagnetic layer, and a part formed into a shape that defines the molding face and a forming plane. A base of the heating device supports the metal sheet. An inductor of the heating device provides the induction heating of the metal sheet.