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Strategy employed to fabricate 3D multi-material porous scaffolds with internal and external porosity. (a,b) Multi-material 3D printing of poly (lactic acid) (PLA)/poly (ε-caprolactone) (PCL) parts, (b,c) foaming of the parts using supercritical CO2 (SCCO2), (c,d) surface porosity formed using the breath figures approach.
