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Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
Stress relaxation modulus as a function of time for PLA-based materials showing (A) complete, and (B) incomplete relaxation. The green area highlights the region in which (according to the Dahlquist criterion) interlayer bonding is expected.