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. 2021 Feb 13;13(4):562. doi: 10.3390/polym13040562

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© 2021 by the authors.

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/).

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Defects appearing in heat treated part. Black arrows point to expansion burrs that occurred due to inadequate packing of powder support material. The white arrow highlights a large internal void.