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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 (http://creativecommons.org/licenses/by/4.0/).
(A) SEM images of GS, red circles indicate some fractured spheres showing their hollow structure, (B) PCL particles obtained after grinding and (C) 3D printed fibers and disks.