translation.en: And the mechanical properties of most parts made in a 3D printer are notorious for having properties that depend on the orientation with which how you printed it, because of the layer-like structure.
translation.zh: 3D打印的大部分部件 并不受欢迎， 这是因为层式结构导致其机械特性 取决于你打印时的方向和定位。