The presented paper deals with the influence of coloring additives and the setting of process parameters of 3D printing on the mechanical and surface properties of samples made of PLA material. The paper characterizes the process of filament production, as well as the printing of normalized samples on a 3D printer using the additive method Fused Filament Fabrication (FFF). The effect of 3 types of coloring additives is evaluated on the basis of tensile test, hardness test and surface analysis. The evaluated quantities are especially loading force, yield stress, hardness, surface texture, roughness and waviness. The influence of the percentage of sample filling with respect to the mechanical properties of the material is also evaluated. The paper is completed assessing achievements of the results achieved and an overall recommendation for filament manufacturers and users of 3D printers.

The presented article deals with the determination of selected mechanical properties of additive materials used for 3D printing (PETG, PLA, ABS, ABS +, PLA ESD, ASA, PC / ABS). Due to the fact that 3D printing has exploded over recent years and additive manufacturing has become popular in some industries, the quality of input materials and their mechanical properties is extremely important. We used 3D printer Original Prusa MK3 to prepare samples for testing. Individual samples printed from all above mentioned materials were analyzed using selected mechanical tests (static tensile test, hardness tests). In the static tensile test, selected parameters (tensile strength limit, tensile modulus, elongation) were determined for all additive samples, which were statistically processed. The parameters for two methods of measuring hardness were also statistically evaluated, namely Shore and ball indentation. All tested additive materials were compared with the aim of obtaining the final ranking (point evaluation of tested materials with quantification of price costs). The best properties after the performed tests were achieved by the additive material PLA Filament Plasty Mladeč. Aditive manufacturing 3D printing Fused filament fabrication Mechanical properties Tensile test Hardness tests

Abstract. Today's industrial enterprises are confronted by implementation of INDUSTRY 4.0 concept with basic problem -stabilised manufacturing and supporting processes. Through this phenomenon of stabilisation, they will achieve positive digital management of both processes and continuously throughput. There is required structural stability of horizontal (business) and vertical (digitized) manufacturing processes, supported through digitalised technologies of INDUSTRY 4.0 concept. Results presented in this paper based on the research results and survey realised in more industrial companies. Following will described basic model for structural process stabilisation in manufacturing environment.

Results are presented from quantitative research as part of a project on cost variability and cost management systems. The main objective was to analyze principal findings stemming from determining perception of cost behaviour in practice of industrial firms. Special attention was paid to selected cost groups, especially logistics costs. The main part presents results verified through statistical inspection of dependence relations. Key discoveries comprise significant drawbacks for manufacturing enterprises and reservations they hold about overhead cost management. Additionally, it was found that the share of overheads remained relatively high. Furthermore, confirmation was made on the close differences between company size and diligence paid to managing variable and fixed costs. It was also confirmed that senior executives were uninformed about asymmetric cost behaviours or the influence of factors beyond production capacity. Logistics costs were identified from the perspective of the cost behaviour problem. Crucial findings are discussed in the final part of the paper.

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