The drying step of the materials was carried out in separate vacuum dryers for 24 hours at a temperature of 100 ºC (HAp powders) or 60 ºC (polymer granules). The extrusion process was carried out using a Thermo Fisher Scientific twin-screw extruder (D = 20 mm, L/D = 40) at a screw rotational speed of 200 rpm and a barrel temperature of 125 °C. The extrudates were collected using a Thermo Scientific filament winding system at a speed of approximately 1 m/min. Finally, the extruded materials were granulated using a Brabender pelletiser and then moulded using a BOY XS micro-injection molding machine. All materials were injected under similar conditions, with a temperature of 130 ºC in all heating zones and a pressure of 150 bar. The mould cooling temperature was 40 ºC, and the total duration of a single injection cycle was approximately 20 seconds.