## 3 Results  
For the procedure samples printing, the hexagonal infill pattern and the different number of contour layers were selected, presented in Figures 2 and 3, respectively. The infill density of the samples was set to 30%, 50%, 70%, 90%, and 100%, while the number of contour layers was set to 3, 5, 7, 9, and 11. For all configurations of infill volume and contour layers, five samples were prepared of each type. Results presented in the tables and figures are the average values calculated from the measurements, with additional error bars covering the highest and lowest measured values. \begin{table}
\begin{tabular}{c c c} \hline \hline
**Parameter Name** & **Type 1A** & **Type 5A** \\ \hline l\({}_{3}\)-overall length & \(\geq\)150 mm & \(\geq\)75 mm \\ l\({}_{2}\)-parallel length & 105 mm & - \\ l\({}_{1}\)–narrow section length & 80.0 \(\pm\) 0.2 mm & 25.0 \(\pm\) 1 mm \\ r-radius & 60 mm & - \\ r\({}_{1}\)-radius & - & 8.0 \(\pm\) 0.5 mm \\ r\({}_{2}\)-radius & - & 12.5 \(\pm\) 1 mm \\ b\({}_{2}\)–grips width & 20.0 \(\pm\) 0.2 mm & 12.5 \(\pm\) 1 mm \\ b\({}_{1}\)–gauge width & 10.0 \(\pm\) 0.2 mm & 4.0 \(\pm\) 0.1 mm \\ h-thickness & 4.0 \(\pm\) 0.2 mm & 2.0 \(\pm\) 0.2 mm \\ L\({}_{0}\)–gauge length & 50.0 \(\pm\) 0.2 mm & 20.0 \(\pm\) 0.5 mm \\ L–distance between grips & 115.0 \(\pm\) 1 mm & 50.0 \(\pm\) 2 mm \\ \hline \hline \end{tabular}
\end{table} 
Table 1: Detailed dimensions of the samples. Figure 2: Photographs of printed samples with various densities of infill: **(a)** 30%, **(b)** 50%, **(c)** 70%, **(d)** 90%, **(e)** 100%. The orientation of the printed samples on the support table is presented in Figure 4. The most common arrangement for the fabrication of 3D printed models is \"flat\" (Figure 4b), but we also wanted to evaluate other printing directions. Therefore, the following orientation for printing was \"horizontal\" (Figure 4a), followed by building along the \(Z\)-axis, \"vertical\" (Figure 4c). Such orientation of the samples allows the different arrangement of the infill inside the samples and a different number of perimeter layers. With such preparation of samples, we were able to evaluate the influence of the printing direction on the mechanical properties. Additionally, Figure 5 shows the differences in cross sections of samples depending on the number of contour layers and the type of sample (1A or 5A). Figure 4: Orientation of the samples on the worktable: (**a**) “horizontal”, (**b**) “flat”, (**c**) “vertical”. Figure 5: Cross sections of samples: (**a**) type 1A, 3 layers of contour, (**b**) type 1A, 5 layers of contour, (**c**) type 1A, 7 layers of contour, (**d**) type 1A, 9 layers of contour, (**e**) type 1A, 11 layers of contour, (**f**) type 5A, 3 layers of contour. Figure 3: Photographs of printed samples showing the difference in the number of contour layers: (**a**) 3, (**b**) 5, (**c**) 7, (**d**) 9, (**e**) 11, with the same value of infill, 50%. Tensile strength tests depending on the printing orientation of the samples on the working table are presented in Figure 6. Samples were printed with a layer height of 0.2 mm, three layers of contour, and 50% infill density. For comparison, the results of the injection molded parts are denoted on the graph. The influence of the infill density of printed samples was also analyzed (Figure 7). A comparison is presented for the same printing parameters as previously prepared for the 1A test samples printed in \"flat\" orientation. The infill pattern for individual samples is presented in Figure 2. Once again, for comparison, the results of the injection molded parts are denoted. The effect of infill density and the number of contour layers on the \"flat\" printed samples are compared in Figure 8. We can observe a significant influence of the contour on the infill inside the printed samples, which is illustrated in Figures 3 and 5. Figure 6: The influence of the orientation of printing on the mechanical properties of the samples. Figure 2:0 The influence of the infill density of printed samples on their mechanical properties.