3D printing/additive manufacturing Harmonix AFM PLA PLGA PLLA SAXS SPIF WAXS X-ray diffraction XRD atomic force microscopy biaxial elongation biobased films biodegradable nanofibers bioresorbable polymers bioresorbable vascular scaffolds breathable film carbon black carbon nanotube cavitation chain orientation collagen compatibilizer composite composites compression molding conductive filler conductive polymer composites contact angle controllable gas permeability