There is a growing need for 3D printing of polymer structures in a cost-effective way and green. This study presents an experimental approach to investigate structural parameters effects on mechanical properties of polylactic acid (PLA) hollow-sphere structures manufactured with fused deposition modeling (FDM). The mechanical behavior characteristics of square_hexagonal stacking, closed_open porosity and parallel_perpendicular compression direction compared to the direction of manufacture under quasi-static uniaxial compression are examined using Taguchi method. The S/N ratio analysis and the Analysis of Variance (ANOVA) were used to find the optimal parameters that improve the mechanical properties (Young modulus, yield strength) and to provide a significant ranking of the different parameters analyzed in this paper. It was found that the optimum level and significance of each process parameter vary for “hexagonal cells,” “open porosity” and “parallel direction.” The optimal values of the results give a Young modulus E of 90.12 MPa and a yield strength ${\sigma }_y$ of 3 MPa. Furthermore, the experimental results further reveal that the porous structure with the loading direction that is parallel to the direction of manufacture, has a higher strength and a progressive collapse of the cells to those with a perpendicular direction.

对以具有成本效益和绿色的方式进行聚合物结构 3D 打印的需求日益增长。本研究提出了一种实验方法来研究结构参数对使用熔融沉积模型 (FDM) 制造的聚乳酸 (PLA) 空心球结构的机械性能的影响。与准静态单轴压缩下的制造方向相比，使用田口方法检查了方形_六边形堆叠、封闭_开放孔隙率和平行_垂直压缩方向的力学行为特性。信噪比分析和方差分析 (ANOVA) 用于寻找改善机械性能（杨氏模量、屈服强度）的最佳参数，并对本文中分析的不同参数进行重要排序。发现每个工艺参数的最佳水平和显着性因“六边形单元”、“开孔率”和“平行方向”而异。结果的最佳值给出了 90.12 MPa 的杨氏模量 E 和屈服强度${\sigma }_{是}$3 兆帕。此外，实验结果进一步表明，加载方向与制造方向平行的多孔结构具有更高的强度，并且单元格相对于垂直方向的单元逐渐坍塌。