Given that the conductive behaviour of the CB-PLA originates from the percolation paths formed by the CB nanofiller , as schematically illustrated in Fig. , the introduction of tensile stresses may affect the density of the percolation paths, eventually affecting the electrical resistance and electrochemical properties of the composite. Thus, the electrical resistances of samples under tensile load were also evaluated. 3D printed samples had initial differences in the electric resistivity, which may arise from the uneven filling of the structures with conductive material and non-uniform doping of the filament .