<p>This study develops a material-sensitive circular supply chain framework for FDM systems based on a qualitative comparative and literature-driven analysis. While existing research primarily emphasizes process-level sustainability, limited attention has been given to material-dependent circular supply chains and their environmental implications. To address this gap, the present work adopts a qualitative comparative assessment combined with a conceptual modeling approach, based on a structured synthesis of existing literature. The analysis focuses on three representative materials—PLA, wood-PLA, and copper-PLA—to examine their respective supply chain configurations, circularity pathways, and environmental impact profiles. The results highlight significant differences in circularity potential depending on material composition. PLA and wood-PLA exhibit favorable characteristics for decentralized circular systems, particularly through mechanical recycling and, in some cases, industrial composting. In contrast, copper-PLA composites present more complex recovery challenges, with circularity outcomes strongly dependent on factors such as metal content, particle characteristics, and available recycling technologies. Based on these findings, an integrated circular supply chain framework is proposed, incorporating forward logistics, reverse logistics, and material-dependent circular pathways (technical, biological, and metallic loops). The framework provides a structured and system-level perspective to support decision-making in sustainable additive manufacturing. Although the study remains qualitative and literature-based, it offers valuable insights into the role of material selection and supply chain design in achieving circularity. Future work should focus on quantitative validation through life cycle assessment and techno-economic analysis.</p>