Figure summarizes the results of microindentation hardness testing for both PLA-based materials (blue columns) and PCL-based materials (orange columns). In general, the micromechanical properties can be split in two groups : stiffness-related properties (EIT and HIT) and viscosity related properties (CIT and ηIT). According to Oliver and Pharr theory , the indentation modulus, EIT, is proportional to macroscale modulus, E (EIT  E). Tabor relation relates indentation hardness, HIT, to macroscale yield stress, Y (H  3Y). The indentation creep, CIT, of polymer materials was shown to correlate with the macroscale tensile creep . The elastic part of the indentation work, ηIT, takes the value of 100 % for ideally elastic specimens (immediate and completely reversible deformation) and 0 % for ideally plastic specimens (permanent and completely irreversible deformation) .