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Cross-section SEM images of 3D-printed samples with a variable thickness of (a) 200 µm, (b) 400 µm, (c) 600 µm, and (d) 800 µm. (e) Representation of the thickness of the printed part (as printed) versus the foamed part. (f) Representation of the porous layer and the solid inner layer as a function of the thickness of the printed part foamed. (SCCO2 treatment conditions: 200 bar and 31 °C).
