3D printing is already present in the construction industry today; however, for its wider application in this field, further refinement of printing technology, the adoption of appropriate legislation and standards, and more detailed research into the mechanical characteristics of materials are still required. The latter was also the main focus of this thesis, with an emphasis on the influence of different environmental conditions to which the printed materials could potentially be exposed. Mechanical properties were tested on the following materials: PLA, PLA Silk, PLA Pine, PETG, ABS, and ASA. During the printing of the test specimens or rather small beams, 100% infill was used, with layers oriented perpendicular to each other, and the initial layer set at a 45° angle. All measurements as part of the testing were carried out at the Faculty of Civil and Geodetic Engineering, University of Ljubljana. The thesis first presents a brief overview of the history of 3D printing and its application in construction. This is followed by a description of the tested materials and the process of specimen fabrication, measurement procedures, and the three-point bending test. Finally, the test results and the analysis of the obtained values are presented. We found that the selected material has a strong influence on the mechanical properties of the element, while for some materials the impact of the tested factors was not statistically significant. Materials with a similar chemical composition exhibit similar mechanical properties. The greatest influence on property changes comes from time, i.e., material aging, whereas differences due to varying environmental conditions are mostly negligible.
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