A computerized flexible innovative system for producing structures made of resin, composites, and the like, characterized by the presence of a self-shielded electron gun and by a movement that enables the availability of all those degrees of freedom necessary for positioning the product in every point thereof under the electron beam in order to obtain step-by-step, in real time, polymerization of the product as this is assuming its definitive configuration, which will be completely and uniformly polymerized and hence completely defined. The system is provided with a variety of modalities of feed of the composite material, e.g. dispensers of thin layers of resin, of impregnated fibres and tapes of different types that with their arrangement in a programmed way, which is no longer constrained by the geodetics, opens an innovative capacity of design of tanks, products, and structures that are more resistant and less expensive.