Materials are the driving force behind the evolution of additive manufacturing (AM), transitioning from prototyping to full-scale production. The ongoing quest for printable, sustainable, and multifunctional materials is continuously reshaping the AM industry. This column explores a wide range of materials—including metals, polymers, ceramics, composites, and graded or multi-material structures—along with the compositional, microstructural, and post-processing factors that affect their performance. The aim of this column is to integrate materials science with AM technology, facilitating innovative applications across various sectors such as aerospace, energy, electronics, and healthcare.