Annealing slightly promoted layer fusion at fiber contact points (Figure ) and induces a moderate but nonsignificant increase in elastic modulus, from 49.1±4.8 MPa to 53.4±6.9 MPa, indicating increased construct stiffness (Figure ). However, annealing significantly increases the brittleness of the material, and the resulting tubes exhibited a typical curve seen in quasi-brittle materials, featuring a sharp region of high stiffness followed by post-peak softening behavior, which indicates the gradual decay of tensile stress through the growth of internal micro-cracks.