Extrusion-based 3D printing is widely used to fabricate precise and accurate 3D structures with nanocellulose suspensions due to its excellent material flow control and system stability. The current issues related to high concentration nanocellulose 3D structures are low printability, layers adhesion, shape fidelity, and mechanical strength. Herein, the issues associated with 3D printed concentrated nanocellulose structures were resolved by mixing different concentrations of tannic acid. The printing parameters of a twin-screw extruder, tannin acid content, and drying conditions were optimized for concentrated nanocellulose paste. The mechanical results showed that tannic acid effectively improved the adhesion between printed layers, as confirmed by a scanning electron microscope.
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