Lukas Hruzik

This study provides a mechanical characterization of commercially available SLA resins processed via Low Force Stereolithography (LFS). Multiple rigid and elastic materials with varying properties were tested under tensile, compressive, bending, and torsional loads according to ISO standards, complementing manufacturer data based on ASTM methods. Samples were printed under controlled conditions and evaluated using unified protocols. Results revealed notable differences in mechanical performance and confirmed the strong influence of post-curing, especially on tensile and bending behavior. Polynomial and bilinear regression models effectively described stress–strain responses. Surface roughness analysis showed correlations between surface quality and mechanical strength, particularly in brittle resins. These findings support better selection and optimization of SLA materials, highlighting the importance of process parameters, resin formulation, and post‑processing.

In recent years, plastic and metal 3D printing has experienced massive development in the professional and hobby spheres, especially for rapid prototyping, reverse engineering, maintenance and quick repairs. However, this technology is limited by a number of factors, with the most common being the cost and availability of the technology but also the lack of information on material properties. This study focuses on investigating the material properties of PLA, PETG, HIPS, PA, ABS and ASA in order to elucidate their behavior in terms of wear and thermal resistance. The research builds on previous studies focusing on the mechanical properties of these materials and includes wear testing and DMA analysis. Weight loss, frictional forces, and frictional work including relative frictional work are recorded as part of this testing. The storage modulus and loss modulus including tan(δ) were then measured using DMA.

Modern industry should apply modern design in the construction of production facilities. This is typically the case with belt production, where parts are moved towards the worker, or when moving parts from the factory to the warehouse and shipping area. There is a relatively high energy consumption associated with moving these parts. The size of the consumption is mainly determined not only by the size of the transported components and the transport technology, but also by the design of the hoppers used for transport. One way to reduce material handling costs is to make the equipment used for moving parts more efficient. A more efficient carrier should, above all, be lighter. Topological optimization can serve very well for this weight reduction. Of course, the reduction in weight not only has an effect on lower power consumption, but also on the wear of other components. Hence, later in this article, we try to quantify these impacts and assess how much benefit the use of a modern designed carrier can bring. It is also important to consider the cost of producing new carriers versus modifying existing ones. The paper describes the application of the modern designed carrier and compares it with the existing carriers as well as modified existing carriers.

This article deals with the uniformity of the distribution of axial forces between the individual bolts of the clamping sleeve. Clamping sleeves are machine components connecting the shaft to the hub using contact force. For sleeve pretension, bolts are used and positioned symmetrically with respect to the axis of the clamping sleeve. Though the bolts are placed symmetrically around the axis, the bolt axial forces are not uniformly distributed when the bolts are tightened according to the manufacturer’s catalog. First, this article describes the procedure for tightening the sleeve bolts according to the manufacturer’s catalog. In the next part of the article, an FEA simulation of sleeve tightening is performed. The FEM simulation is then compared with the values found by measurement.