Metamaterials, engineered to exhibit extraordinary properties not typically found in naturally occurring materials, represent a revolutionary advance in material science. The highly controlled and sometimes counterintuitive properties of these materials are reshaping our understanding of material behavior. For example, a metamaterial may show a negative Poisson’s ratio—which allows materials to expand perpendicularly when loaded under tension—or optical cloaking capabilities, which enable light to bend around objects, rendering them invisible. Traditionally, metamaterials are categorized based on their interaction with different forms of excitation: electromagnetic, acoustic, mechanical, or thermal. Shaping the interaction of material with these stimuli requires designing micro- and macro-structures to obtain the desired functionality. Over the years, many structural architectures have been proposed for metamaterials based on theoretical and numerical studies but only a small number of them could be realized due to the limitations of the manufacturing methods. Recent advancements in additive manufacturing methods have played a pivotal role in unlocking the potential of these geometries, facilitating rapid exploration and realization of metamaterials’ novel properties. As a result, metamaterials are set to transform various sectors from aerospace to electronics and medical imaging.