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. 2021 Dec 21;8:21. doi: 10.1186/s40694-021-00129-0

Fig. 9.

Fig. 9

a Schematic diagram of the in-house adapted 3D printer for extrusion-based AM and the morphology of the filaments after being extruded and deposited on the substrate. b Schematic diagram of AM models for stackability test and c the dimensions (in mm) of the filament collapse test pillar plate