3D printing opens up new possibilities for the production of polymeric structures that would not be possible with injection molding. However, it is known that the manufacturing method might have an impact on the mechanical properties of manufactured components. To this end, the mechanical behavior of test specimens made of thermoplastic polyurethane is compared for two different manufacturing methods. In particular, the SEAM technology (screw extrusion additive manufacturing) is compared to a conventional injection molding process. Uniaxial tension test specimens from both manufacturing methods are analyzed in two testing sequences (multi-hysteresis tests to analyze inelastic properties and uniaxial tension until rupture). To get as less perturbation as possible, the 3D-printed samples are printed with only one strand per layer. Moreover, a correction approach based on optical measurements is applied to determine the true cross-sectional area of the test specimens. The mechanical tests reveal that the inelastic material behavior is the same for both manufacturing methods. Instead, 3D-printed specimens show lower maximal stretch values at rupture and an increased variance in the results, which is related to the surface structure of 3D-printed specimens.

3D打印为生产聚合物结构开辟了新的可能性，而注塑成型是不可能的。然而，已知制造方法可能对所制造的部件的机械性能产生影响。为此，对两种不同的制造方法对由热塑性聚氨酯制成的试样的机械性能进行了比较。特别是，将SEAM技术（螺杆挤出增材制造）与常规注塑工艺进行了比较。两种制造方法的单轴拉伸试样按两个测试顺序进行分析（多磁滞测试，以分析非弹性性能和单轴拉伸直至断裂）。为了获得尽可能少的干扰，将3D打印的样本每层仅打印一条绞线。而且，采用基于光学测量的校正方法来确定试样的真实横截面积。力学测试表明，两种制造方法的非弹性材料性能相同。取而代之的是，3D打印的标本在断裂时显示出较低的最大拉伸值，并且结果差异增加，这与3D打印的标本的表面结构有关。