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A D V A N C E D M A T E R I A L S & P R O C E S S E S | O C T O B E R 2 0 2 0 1 8 cases, and the WR also decreased mar- ginally from 3.2 x 10 -4 to 2.7 x 10 -4 mm 3 / Nm as the PLT was increased from 0.1 to 0.4 mm. By evaluating the tribosur- faces, it is also hypothesized that, along with PLT and other printing variables, external factors like the formation of tri- boactive tribofilms has a significant role in controlling the tribological behavior of FFF-printed samples. ~AM&P For more information: Surojit Gupta, surojit.gupta@und.edu. Acknowledgment We would like to thank Anton Sa- lem and Lily Kuentz for their help in the 3D printing of samples. NASA EPSCoR is acknowledged for funding of this work. Saud Abu Aldam is acknowledged for machining the samples. References 1. h tt ps : / /www.e l l enmaca r t hu r foundation.org /circular-economy/ concept. 2. M. 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