Development of acrylonitrile–butadiene–styrene (<scp>ABS</scp>)/natural fiber composite filaments for innovative <scp>3D</scp> and <scp>4D</scp> printing

Abstract Fruit wastes from the agro‐industry may be used in the preparation of polymer/natural fiber composites. In the current scenario, there is a growing need for sustainable materials that can reduce environmental impact while maintaining or enhancing material properties. One promising approach is the incorporation of natural fibers derived from fruit waste into polymers, which aligns with the global push toward eco‐friendly and circular economy solutions. This work was aimed at the development of filaments of acrylonitrile–butadiene–styrene (ABS)/natural fiber composites for 3D and 4D printing. The fibers used were banana (BAN) peel, orange (ORG) peel, cinnamon (CIN), and neem (NEEM) leaf fibers. The rheological, mechanical, and shape memory properties of the ABS/BAN and ABS/ORG composites were compared with those of the ABS/CIN and ABS/NEEM composites. A slight decrease in viscosity was observed with the addition of the natural fibers to ABS. The ABS/ORG composites showed the highest mechanical properties and good adhesion between the printed layers. The particulate eco‐friendly natural fibers can also be used as pigments, where different types of colors can be obtained. The ABS/natural fiber composites can be processed at the same processing conditions as ABS. The incorporation of natural fibers significantly increased the shape memory result. The use of ABS/natural fiber composites proved to be feasible for preparing the filaments and 3D/4D printing of objects. Highlights The properties of 3D/4D‐printed ABS/natural fiber composites were investigated. Banana and orange peel, cinnamon, and neem leaf fibers were used. Filaments of ABS/natural fiber composites were successfully obtained. The addition of the fibers to ABS decreased the viscosity and increased shape memory. Among the composites, ABS/orange peel showed the highest mechanical properties.