Abstract: A device for forming in series flat objects and notably thin cakes of particular shape, on any application wall, from a substance of sufficiently fluid consistency is disclosed. The device comprises a hollow feeding drum mounted rotatably on a hollow shaft, suited to be placed in contact with application surface, the surface of the feeding drum comprising at least one opening whose shape is selected in accordance with the shape to be given to each flat object. A feeding system is connected to the shaft for feeding the fluid substance into the drum comprising a radially extending spreading element for applying the fluid substance onto the application surface through the opening. The radially extending spreading element communicates with the inside of the shaft and is set radially between the shaft and the inner face of the drum wall. A guide is provided for keeping the radially extending spreading element in contact therewith.