The rapid development of 3D printing technology and the models created using this technology has encouraged the desire for research in this field. The subject in this research was simple beam models with different cross – sectional shapes. The beam models were divided into 3 groups: rectangular beams, type I beams, and type I beams with rounded inner edges at the junction of the flange and web. The rectangular beams had a constant height of 15 mm, while the other two types were divided into subgroups. One subgroup represents beams with heights of 22 mm and the other with heights of 26 mm. The total number of models was 59, including one additional carrier which was damaged during the printing process. The mechanical properties examined during this study were the flexural strength and the elastic modulus. A three – point bending test was performed to study these properties. Another difference that proved to be very important regarding the mechanical properties of the beams was the infill pattern as well as the infill density. To analyze the obtained results, a statistical method called analysis of variance was used. In cases where a statistically significant impact of different groups on the variable under consideration was found, an additional statistical method, the Bonferroni test, was applied to determine which groups were statistically significantly different from each other.
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