Method of manufacturing a timing belt with a multifunctional profiled outer face, comprising: - the supply of a prefabricated timing belt as a semi-finished product, provided with a toothed surface on one inner side; - the production of a series of profiled parts (2, 2a, 2b), and - the fixing of said profiled parts (2, 2a, 2b) onto the outside face of the timing belt in order to define a profiled outer face on said timing belt; wherein the following is carried out: - the manufacture of the polyurethane profiled parts (2, 2a, 2b) by means of 3D printing, and the selection of the polyurethane timing belt with a hardness between 65 and 95 Shore and a thickness between 3 and 15 millimetres, in both cases; - heating the surfaces of the profiled parts (2, 2a, 2b) to be joined and the timing belt with a heat lamp with a temperature of 450°C, placed at distances from each of these surfaces of between 3 millimetres for the hardest polyurethane (95 Shore) and 5 millimetres for the softest (65 Shore), and for a time varying according to the thickness and hardness of the parts and the timing belt to be joined, this time between 15 and 21 seconds for polyurethane of a hardness of 65 Shore, and between 18 and 24 seconds for polyurethane of a hardness of 75 and 80 Shore, and between 15 and 27 seconds for polyurethane of a hardness of 95 Shore, and between 18 and 24 seconds for polyurethane of a hardness of 75 and 80 Shore, and between 18 and 27 seconds for polyurethane of a hardness of 95 Shore; between 18 and 24 seconds for polyurethane of a hardness between 75 and 80 Shore, and between 21 and 27 seconds for polyurethane of a hardness of 95 Shore; and - the arrangement of the profiled parts (2, 2a, 2b) in the respective positions on the outer side of the timing belt and the pressing of the profiled parts until they are permanently connected to each other. - the supply of a prefabricated timing belt as a semi-finished product, provided with a toothed surface on one inner side; - the production of a series of profiled parts (2, 2a, 2b), and - the fixing of said profiled parts (2, 2a, 2b) onto the outside face of the timing belt in order to define a profiled outer face on said timing belt; wherein the following is carried out: - the manufacture of the polyurethane profiled parts (2, 2a, 2b) by means of 3D printing, and the selection of the polyurethane timing belt with a hardness between 65 and 95 Shore and a thickness between 3 and 15 millimetres, in both cases; - heating the surfaces of the profiled parts (2, 2a, 2b) to be joined and the timing belt with a heat lamp with a temperature of 450°C, placed at distances from each of these surfaces of between 3 millimetres for the hardest polyurethane (95 Shore) and 5 millimetres for the softest (65 Shore), and for a time varying according to the thickness and hardness of the parts and the timing belt to be joined, this time between 15 and 21 seconds for polyurethane of a hardness of 65 Shore, and between 18 and 24 seconds for polyurethane of a hardness of 75 and 80 Shore, and between 15 and 27 seconds for polyurethane of a hardness of 95 Shore, and between 18 and 24 seconds for polyurethane of a hardness of 75 and 80 Shore, and between 18 and 27 seconds for polyurethane of a hardness of 95 Shore; between 18 and 24 seconds for polyurethane of a hardness between 75 and 80 Shore, and between 21 and 27 seconds for polyurethane of a hardness of 95 Shore; and - the arrangement of the profiled parts (2, 2a, 2b) in the respective positions on the outer side of the timing belt and the pressing of the profiled parts until they are permanently connected to each other. - the manufacture of the polyurethane profiled parts (2, 2a, 2b) by means of 3D printing, and the selection of the polyurethane timing belt with a hardness between 65 and 95 Shore and a thickness between 3 and 15 millimetres, in both cases; - heating the surfaces of the profiled parts (2, 2a, 2b) to be joined and the timing belt with a heat lamp with a temperature of 450°C, placed at distances from each of these surfaces of between 3 millimetres for the hardest polyurethane (95 Shore) and 5 millimetres for the softest (65 Shore), and for a time varying according to the thickness and hardness of the parts and the timing belt to be joined, this time between 15 and 21 seconds for polyurethane of a hardness of 65 Shore, and between 18 and 24 seconds for polyurethane of a hardness of 75 and 80 Shore, and between 15 and 27 seconds for polyurethane of a hardness of 95 Shore, and between 18 and 24 seconds for polyurethane of a hardness of 75 and 80 Shore, and between 18 and 27 seconds for polyurethane of a hardness of 95 Shore; between 18 and 24 seconds for polyurethane of a hardness between 75 and 80 Shore, and between 21 and 27 seconds for polyurethane of a hardness of 95 Shore; and - the arrangement of the profiled parts (2, 2a, 2b) in the respective positions on the outer side of the timing belt and the pressing of the profiled parts until they are permanently connected to each other.