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. 2019 Apr 10;19(7):1706. doi: 10.3390/s19071706

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© 2019 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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(A) Fused deposition modelling (B) Stereo-lithography (C) Polyjet Process (D) Selective laser sintering (E) 3D Inkjet printing (F) Digital light processing.