Neat PLLA and PDLLA spheres were also produced as feedstock [28]. Briefly, the resulting mixtures were poured separately into individual 50 ml syringes and added drop wise into a bath of liquid nitrogen to rapidly induce phase separation. The precipitates were collected in a 500 ml round bottom flask and subsequently freeze-dried to yield porous neat polymer and composite spheres, measuring circa 2–4 mm in diameter, suitably small to enter the extruder feed port.