A device for forming or molding of elements, particularly plastic elements, on surfaces of a semi-finished product, wherein a C-shaped bracket element is configured such that it is movable and positionable locally defined along at least one axis in relation to the semi-finished product by a manipulator, wherein an arrangement (1.4) configured for injection molding is positioned at a first leg (1.1) of the two opposing legs of the C-shaped bracket element and a backing holder (1.4) is positioned at the second leg (1.2) of the C-shaped bracket element opposite the arrangement (1.4) configured for injection molding and the device is implemented such that a semi-finished product can be disposed between the backing holder (1.3) and the arrangement (1.4) when an element is to be formed, and in direction toward a surface of the semi-finished product, at which an element is to be formed, a first molding tool (1.4.1) open in the direction toward the corresponding surface of the semi-finished product and having a negative contour of the corresponding element is disposed, and the arrangement (1.4) and/or the backing holder (1.3) is/are displaceable against the corresponding surface of the semi-finished product, such that the open side of the first molding tool (1.4.1) contacts the corresponding surface of the semi-finished product under application of pressure force and the backing holder (1.3) contacts the opposite surface of the semi-finished product under application of pressure force, when an element is produced by means of injection molding, wherein molding tool (1.4.1) and backing holder (1.3) are then disposed opposite each other, wherein the arrangement (1.4) is configured with a plasticization unit (1.4.3) for metered conveying of plasticized element material into the molding tool(s) (1.4.1, 1.3.1); and wherein the arrangement (1.4.3) is configured with an element material feed (1.4.5) for element material in granular form, which is connected to the plasticization unit (1.4.3). a C-shaped bracket element is configured such that it is movable and positionable locally defined along at least one axis in relation to the semi-finished product by a manipulator, wherein an arrangement (1.4) configured for injection molding is positioned at a first leg (1.1) of the two opposing legs of the C-shaped bracket element and a backing holder (1.4) is positioned at the second leg (1.2) of the C-shaped bracket element opposite the arrangement (1.4) configured for injection molding and the device is implemented such that a semi-finished product can be disposed between the backing holder (1.3) and the arrangement (1.4) when an element is to be formed, and in direction toward a surface of the semi-finished product, at which an element is to be formed, a first molding tool (1.4.1) open in the direction toward the corresponding surface of the semi-finished product and having a negative contour of the corresponding element is disposed, and the arrangement (1.4) and/or the backing holder (1.3) is/are displaceable against the corresponding surface of the semi-finished product, such that the open side of the first molding tool (1.4.1) contacts the corresponding surface of the semi-finished product under application of pressure force and the backing holder (1.3) contacts the opposite surface of the semi-finished product under application of pressure force, when an element is produced by means of injection molding, wherein molding tool (1.4.1) and backing holder (1.3) are then disposed opposite each other, wherein the arrangement (1.4) is configured with a plasticization unit (1.4.3) for metered conveying of plasticized element material into the molding tool(s) (1.4.1, 1.3.1); and wherein the arrangement (1.4.3) is configured with an element material feed (1.4.5) for element material in granular form, which is connected to the plasticization unit (1.4.3).