Additive manufacturing (or 3D printing) is gradually becoming one of the key technologies in advanced manufacturing. It influences all industrial sectors and, consequently, most of the CEA’s R&D programmes, particularly in the field of low-carbon energy, including nuclear energy. At CEA, many applications and uses of additive manufacturing are being developed: from managing the obsolescence of some nuclear power plant parts that are no longer manufactured in the factory to supporting the storage of radioactive packages, optimising materials for future nuclear power plants or even improving the safety of power plants through in situ monitoring. On the subject of nuclear waste management, CEA, as part of the DIADEM project, has developed a prototype metal shock absorber identical to those used in the industrial world and which play their role as shock absorbers for waste packages if they fall. These shock absorbers are made of a metallic material that can crush on itself by more than 70% without observing any lateral separation. This type of material can have applications in other fields such as acoustics, ballistics or the transport of nuclear waste.