## 4 Conclusions  
In general, composite materials and materials for large-format additive manufacturing can be used as an alternative to steel structural materials for the production of water tanks. The great advantage of glass or carbon fibers is that they can be molded into various shapes, so they have a wider range of use. The biggest disadvantage of these fibers is their price, which tends to be higher compared to classic materials. Composites based on glass fibers can be used as an alternative to steel structural materials in production, which has also been tested in a real operation.  
The disadvantage of composite materials compared to additive manufacturing is the time-consuming production. In this case, it is necessary to make a form that is related to the resulting shape. The more complex the shape is, the more demanding and expensive the production. The mentioned fact disappears in the case of additive manufacturing, where practically any shape can be produced. It is sufficient to have an experienced designer who will design the relevant structure and a large-format 3D printer to produce the designed structure.  
The development of large-scale AM has created many opportunities for innovation in the manufacturing industry. It has also created some challenges, especially in the way parts are designed. In this paper, we tried to follow-up on new solutions where it is possible to use AM in the form of LFAM.  
Based on the results of the strength and deformation analyses, we see the potential use of LFAM in tank manufacturing as a beneficial technology for the solution of atypical, custom-made water tanks. Of course, the above analyses, as we have already discussed in the results, are an important basis for the next stage of research at our department as well as a suggestion for follow-up research at other departments worldwide that deal with similar problems. We can say that the presented results are an initial (basic) step toward further simulations and analyses. Next, our analyses will focus on testing different 3D printing structures for the selected filaments, testing the tightness of the individual layers, thermal resistance, usability of additive materials added to the filaments, and last but not least, operational testing. In conclusion, we can say that the developments in this field are perspective, and that the results are applicable in the development of this subject in operational conditions.  
**Author Contributions:** Conceptualization, M.H., R.H. and S.K.; Methodology, M.H., R.H. and S.K.; Validation, M.H. and R.H.; Formal analysis, M.H., R.H. and S.K.; Investigation, R.H. and S.K.; Resources, R.H. and M.D.; Data curation, R.H. and S.K.; Writing-original draft preparation, M.H., R.H., M.D. and S.K.; Writing-review and editing, M.H., R.H. and S.K.; Visualization, R.H., S.K. and M.H.; Supervision, R.H., S.K., M.H. and M.D.; Funding acquisition, M.D. and R.H. All authors have read and agreed to the published version of the manuscript.  
The paper was written based on the research intention and solution of the research project \"Progressive Research into Utility Properties of Materials and Products Based on Wood (LignoPro)\", ITMS 313011T720, supported by the Operational Program Integrated Infrastructure (OPII) funded by the ERDF.  
Not applicable.  
The data presented in this study are available on request from the corresponding author ([EMAIL_ADDRESS]).  
The authors declare no conflicts of interest.