For this study, PLA-based materials were prepared, including pure PLA, composites with 20 wt% HAp (both µHAp and nHAp) and composites with 40 wt% HAp (both µHAp and nHAp). The same procedure was used for PCL, but due to technical limitations (high melt viscosity, which prevents further processing), only 20% filler was used. The exact compositions and sample nomenclature are given in Table . The procedure for producing materials is presented illustratively in Figure .