## 2 Materials and Methods
The material properties are shown in Table 1.  
The steel tank was made of the S235 JR material (U.S.Steel Kosice, SK) produced by the welding technology. The production of the composite tank was carried out by hand in a manufactured wooden mold by depositing six layers consisting of M5 mat and M105 TB resin. It is a case of the physical mixing of layers of glass fibers with a resin binder. The M5 chopped strand mat is made from the Advantex(r) Glass Roving chopped strands and are held together by an emulsion binder, soluble in styrene, which gives the M5 excellent compatibility with UP resins. The basic strand offers a sizing that contains a silane coupling system [33]. The AROPOL(tm) M105 TB (INEOS Composites, Dublin, OH, USA) Low Styrene Emission Resin is a thixotropic pre-accelerated orophthal based polyester resin with a moderate gel-time [34]. The resin is suitable for manual lamination or spraying to produce various moldings and composites. The structural solution of the tank is shown in Figure 2. During the simulation, a tank without an upper cover (lid) was considered. \begin{table}
\begin{tabular}{c c c c c c} \hline \hline \multirow{2}{*}{**Material**} & **\(\mathbf{E}\)** & \(\mathbf{\mu}\) & \(\mathbf{\rho}\) & \(\mathbf{m}\) & **Tensile Strength** \\  & **(MPa)** & **(-)** & **(kg\(\cdot\)m\({}^{-3}\))** & **(kg)** & **(MPa)** \\ \hline Steel & 210,000 & 0.3 & 7850 & 623.84 & 340 \\ \hline ABS & 1400 & & 1080 & 85.83 & 30 \\ \hline ASA & 1900 & & 1080 & 85.83 & 40 \\ \hline HI-TEMP & 4400 & & 1390 & 110.46 & 61 \\ \hline HI-TEMP CF & 7000 & & 1200 & 95.36 & 65 \\ \hline PA6/66 & 2325 & & 1120 & 89.01 & 67 \\ \hline PA12 CF & 3500 & 0.35 & 1060 & 84.24 & 71 \\ \hline PETG & 2100 & & 1270 & 100.93 & 50 \\ \hline PLA & 3600 & & 1240 & 98.54 & 60 \\ \hline PLX & 3150 & & 1250 & 99.34 & 48 \\ \hline PRO HT & 3300 & & 1300 & 103.31 & 45 \\ \hline TPU 98A & 2410 & & 1180 & 95.36 & 40 \\ \hline \multirow{2}{*}{Composite} & M105 TB resin & 3600 & 0.3 & 1078 & 55 \\The material for the additive manufacturing was selected from the BigRep manufacturer, which deals with large-format 3D printing. Suitable materials include [35, 37, 38, 39, 40, 41, 42, 43]:  
* **ABS** (acrylonitrile butadiene styrene) is a FFF (fused filament fabrication) technology with the characteristics listed in Table 2. It is used in the automotive industry, in industrial applications, and consumer products. * **ASA** (acrylonitrile styrene acrylate) is a technically high-quality fiber used in the design of industrial parts with the characteristic properties listed in Table 2.
* **HI-TEMP** (biopolymer) is a highly heat-resistant material used in industrial as well as general applications. Its basic characteristics are listed in Table 2.
* **HI-TEMP CF** (biopolymer with carbon fiber) is a durable material with shape stability even when exposed to high temperatures. The basic characteristics are listed in Table 2.
* **PA6/66** (polyamide 6/6.6 copolymer) is suitable for industrial applications due to the high strength and stiffness of the fiber. The key properties are listed in Table 2.
* **PA12 CF** (polyamide 12 carbon fiber) is widely used in many industrial applications due to its strong and heat-resistant fiber. The basic characteristics are listed in Table 2.
* **PETG** (polyethylene terephthalate, glycol-modified) is an alternative to PLA and ABS filaments in terms of strength and toughness. The basic characteristics are listed in Figure 1:0
* **PLA** (polylactic acid) is used for more demanding industrial production (printing of larger objects) with sufficient strength and stiffness. The key properties are listed in Figure 1:1
* **PLX** (polylactic acid blend) is a fast-printing filament for the industrial production of large-format products. The key properties are listed in Figure 1:2
* **PRO HT** (biopolymer) is environmentally friendly, and suitable for the production of general purpose products.