— From a bibliographical point of view: The work carried out under this project will make it possible to publish in international journals and to present them at international conferences with a reading committee in the field of additive manufacturing, as well as in the field of digital mesh/simulation. — From a digital point of view: Software to control the trajectory of the nozzle based on meshing and re-message techniques has been put in place. This software will be coupled with a digital simulation software so that it can take into account areas of high stress in the room when it is used. It will provide a file in a 3D printer-readable format — Experimentally: 2.5D and 3D parts will be manufactured on UT’s printers, coupled with the developed digital tool. The mechanical fit of these parts and the amount of thread used during printing will validate the digital model developed. This OPTIFABADD digital tool will describe a process of modeling the optimal internal structures of a part. Experimental laboratory validations by 3D printing of parts with optimised structures as well as industrial study cases provided by a company in the region will validate the process and the results. Additive manufacturing by deposition of hot wire called FDM is now increasingly used by industrialists.