## 1 Introduction
Due to the work of authors on the article [31] pure PLA plastic was used with no color to perform the tests. As the material must be extruded in layers, and has a certain thickness predefined by the nozzle, and often require lots of post-processing to acquire a professional, finished look. In addition to describing the behavior of the influence of process parameters of 3D printing technology in the analysis of PLA material, research on the optimization of influential parameters using mathematical models was also carried out [32; 33]. Research has also been conducted on the influence of metals on the PLA composition [34; 35; 36; 37]. Biodegradable PLA composites have huge potential in healthcare but for their application is important to have exact knowledge about the prediction of degradation [38]. A similar production process as FDM uses Bound Metal Deposition (BMD) technology where the metal dust is held together by polymer and wax. After the extrusion process, the component is then sintered in the furnace where all the binder is removed and only the compacted metal part remains. When sintering, always work with only one material because different metals have different melting temperatures. Similarly, when using PLA plastic and additives, heat treatment of polymer matrix (of course at much lower temperatures for PLA to crystallize) can increase the thermal performance of the final product. In the used procedures, it is not desirable to break down the plastic element as in BMD [39; 40; 41]. In the production process, a composite can be further formed where PLA plastic is combined with various additives. In certain cases, it is suitable to have parts with a higher metal content, where the individual grains are insulated from each other by plastic. For example, the cores of transformers are divided into thin plates to reduce eddy currents. In this case, even smaller units are created. If plastic-containing metals are used, the weight can be reduced compared to conventional metal parts or the efficiency can be increased compared to a complete plastic core. The paper analyses and explains the basic parameters of the given sample produced by a 3D printer. It points out the fact that the mechanical properties of the test sample are affected not only by the composition of the material itself but also by the operating parameters of the machine. Current standards do not define exactly all the conditions of how samples to be torn should be produced. An inexperienced user may produce test samples of the desired form looking visually correct, but with errors that invalidate the test itself. Based on the knowledge of influencing the orientation of internal structures it is possible to determine the final parameters of produced parts such as appearance or strength. For needs of further research, approaches were chosen materials PLA and add-mixtures in PLA matrix. PLA has a huge potential for the creation of a wide variety of composite filaments, production for 4D printing, and is ecological (industrially compostable). Despite the different proportions of admixtures PLA material can be easily joined as filament before the 3D printing process or during layering in the printer. Such approaches help in the creation of functional assemblies in one production process where individual parts have different properties. It is not necessary to manually join simple parts into larger complex bodies. 3D printing allows a change in the design of structures, which leads to a reduction in material consumption by the creation of complex shapes.