Using light-activated 3D printing to manufacture self-healing hydrogels with complex architectures The scientific community is focusing its research into the multiple applications of Hydrogels, polymeric materials which contains a large amount of water, that have the potential to reproduce the features of biological tissues. This aspect is particularly significant in the field of regenerative medicine, which since a long time has already recognized and been using the characteristics of these materials. In order to be used effectively to replace organic tissues, hydrogels must meet two essential requirements: possessing great geometric complexity and, after suffering of a damage, being able to self-heal independently, exactly like living tissues.