In this work, an approach has been developed for the accelerated aging of test specimens with an electrical furnace for tensile strength and hardness testing, manufactured using a 3D Fused Deposition Modeling (FDM) printer. A detailed study of the climatic conditions and temperature amplitudes of the city of Sofia, Bulgaria, over a period of one calendar year was conducted. The ASTM D3045 standard was used, and numerical expressions were compiled, which guided the authors in determining the period and temperature of heating. Eight types of FDM 3D printing materials with different properties and characteristics were used in this study.

This article presents a methodology for experimentally determining the critical speed in a laboratory ball mill. The mill drum (grinding media) and the grinding bodies are made of 3D printed PLA material, the mill covers are made of Plexiglas. The mill designed in this way aims to monitor the movement and interaction of grinding bodies and environment. The critical moments that need to be paid more attention to are presented. The equipment used to measure the speed is a laser tachometer. A high-speed camera was also used to determine the exact moment of reaching the critical speed.

In this work, a comparative analysis of polymer test specimens from different types of filaments, manufactured using FDM technology, was performed. A tensile strength test was executed on test specimens after 3D additive printing, made from different groups of materials—PLA, PLA Wood, PETG, PC, PA6, ASA, CPE HG100 and FilaFlex SEBS. Test specimens from the same materials were subjected to accelerated aging, after which they were tested again for tensile strength. The results of all tests were analyzed and compared.

In the work developed, an overview and analysis of different types of shapes of ball mill lifters are made. An analysis has been made of the factors and paramet In the work developed, an overview and analysis of different types of shapes of ball mill lifters are made. An analysis has been made of the factors and paramet

In the present work, a study of the loading of a robotic palletized module was carried out by simulation with the Solidworks software program. The technical cha In the present work, a study of the loading of a robotic palletized module was carried out by simulation with the Solidworks software program. The technical cha

The present work is based on an experimental determination of the mechanical properties of test bodies made using PolyJet technology from the two-component material Digital ABS Plus. The parameters of the 3D printing of the test bodies and their dimensions are presented. The testing methods and equipment for the studied parameters of hardness and roughness are selected. Roughness studies were conducted according to different test body positions and orientations. Hardness studies were carried out according to the Shore D and Rockwell M scales for three types of test bodies: after 3D printing of their surface; inside the test body; and after applying thermal treatment to the test bodies. These indicators are extremely important in the evaluation of details and the possibility of their implementation in the production process.