The purpose of this paper is to examine the impact of three-dimensional (3D)-printing process settings (particularly print orientation) on the tribological properties of different polymers.,In this study, fused deposition modelling 3D-printing technology was used for fabricating the specimens. To evaluate the influence of print orientation, the test pieces were manufactured horizontally (X) and vertically (Z). The tribological properties of various printed polymers, which are polylactide acid, high tensile/high temperature-polylactide acid and polyethylene terephthalate-glycol have been studied. The tribological tests have been carried out under reciprocating sliding and dry condition.,The results show that the presence of various orientations during the 3D-printing process makes a difference in the coefficient of friction and the wear depth values. Findings suggest that printing structure in the horizontal orientation (X) assists in reducing friction and wear.,To date, there has been very limited research on the tribology of objects produced by 3D printing. This work was made as an attempt to pave the way for future research on the science of tribology of 3D-printed polymers.

中文翻译：

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3D打印结构对聚合物摩擦学性能的影响

本文的目的是研究三维 (3D) 打印工艺设置（特别是打印方向）对不同聚合物摩擦学性能的影响。,在这项研究中，熔融沉积建模 3D 打印技术被用于制造标本。为了评估打印方向的影响，水平 (X) 和垂直 (Z) 制造了测试件。研究了各种印刷聚合物的摩擦学性能，包括聚丙交酯酸、高拉伸/高温聚丙交酯酸和聚对苯二甲酸乙二醇酯。摩擦学试验在往复滑动和干燥条件下进行。结果表明，3D 打印过程中不同方向的存在会导致摩擦系数和磨损深度值有所不同。研究结果表明，水平方向 (X) 的打印结构有助于减少摩擦和磨损。迄今为止，对 3D 打印生产的物体摩擦学的研究非常有限。这项工作旨在为 3D 打印聚合物摩擦学的未来研究铺平道路。