Apparatus for forming a bent sheet of foil, comprising a holder for holding a roll of foil; a motor for horizontally feeding the foil from the roll; a bending station for providing the fed foil with an angled portion; a controller for controlling a desired length of foil to be fed by commanding operation of said motor; and a cutting station for cutting said fed foil at said desired length, whereby to form constant length sheets of said foil. The controller is operable to command operation of the motor to sequentially feed the foil a first distance corresponding to a selected longitudinal dimension of the angled portion and then to feed the foil a second distance corresponding to a selected longitudinal dimension of a foil sheet to be formed.