Features of FDM printing of test specimens

The presented article describes the process of 3D printing using FDM technology and its advantages over the conventional plastic manufacturing technique, as well as the need to study the characteristics of the created 3D models. The technology allows the use of a wide variety of materials that have different mechanical characteristics and resistance to atmospheric influences: PLA, PLA Wood, PETG, PC, CPE, PA and Filaflex. A classification of printing parameters, namely fill percentage and pattern, was made depending on the printed 3D model and printing orientation. The most basic parameters such as printing temperature, heating of the bed, printing speed and cooling are in accordance with the technical characteristics indicated by the manufacturer of the materials and based on analyzes in the literature. CAD models of test specimens were designed for testing tensile strength at normal and elevated temperature, impact and shear resistance. The dimensions of the test bodies are in accordance with European quality standards. The Ultimaker Cura software program was used to prepare the printing programs of the test. A Geroid pattern and a fill density of 30% were used for all test bodies. These parameters are chosen to be applicable to small, standard and functional 3D printed objects.