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This research introduces a method to reversibly join materials by a 3D printed interlock structure. It allows combining chemically incompatible polymers in Multi Material Additive Manufacturing (MMAM), enhancing recyclability without compromising strength or durability. Addressing a key challenge in 3D printing, the proposed method facilitates easy joining and separation of different polymers through controlled heating, enabling efficient recycling. This method represents an advancement in making MMAM more sustainable by improving the recyclability of products made from incompatible polymers.