## 1 Introduction
The research on newly developed methods makes it clear that the micro-CT method is crucial to the holistic quality analysis and improvement of AM components. [PERSON] et al. [14] presented an actual status and application examples that demonstrated CT metrology's ability to control internal dimensions that cannot be measured by traditional coordinate measuring machines, and to combine dimensional quality control with material quality control to achieve a single quality control paradigm. CT metrology has great potential for the dimensional quality control of components with internal cavities that are not accessible by other measuring devices. It also enables the holistic measurement of mechanical components, i.e., the full assessment of the internal and external surfaces of the part, instead of a limited set of points. CT is the only control process that allows for a combination of dimensional and material quality control. [PERSON] et al. [15] provided an overview of the state of the art and upcoming CT technologies, including CT system types, scanning capabilities, and technological advances. The paper provides an overview of application examples from the manufacturing industry, as well as other industries and activities in industrial computed tomography. The authors also identified the limitations and problems of the current CT in industrial applications. The mechanical and geometric properties of specimens produced by the selected laser sintering (SLS) of thermoplastic powders largely depend on the interactions between the following process and material parameters: powder coating, exposure geometry, and material behavior in the solid and molten states [16]. Critical processes' repeatability in serial production can only be improved by the study of the aforementioned interactions [17]. [PERSON] et al. [18] compared the costs, material, and printing time using FDM and SLS, based on the production batch size. In conclusion, the authors stated that FDM is the best choice to print one simple component (it is quicker, cheaper, and has a good result; the only disadvantage is the poor strength, especially in the Z direction). However, in the case of a larger production batch size for the same component, the use of SLS is more advantageous. Research on the mechanical properties of components (dimensional accuracy, tensile properties, and Shore hardness) produced by different AM methods (Polylet, SLA, FDM, SLS) was performed by, e.g., [PERSON] et al. [19]. Each additive manufacturing process and its process parameters were studied in detail, along with a comparison of the mechanical properties of the final components. The order of the dimensional accuracy was PolyJet > SLS > FDM > SLA. The order of the tensile properties (tensile strength) was PolyJet > SLS > FDM > SLA. The order of the Shore hardness was PolyJet > SLA > FDM > SLS. [PERSON] et al. [20] investigated the geometry of a proposed product, which significantly affects the optimal choice of AM technology, both technologically and economically. The results imply that FDM technology shows the greatest restrictions, preventing mass production due to manufacturing time and costs but also environmental impacts. A frequently encountered problem is the aging of the source material. This factor can unfavorably affect the geometric and mechanical properties of manufactured components. [PERSON] et al. [21] researched the processes of polyamide 12 aging (Laurinlactam) in SLS, comparing two different machines, with the objective of analyzing the correlation of the material quality, process parameters, and specimen properties. It was found that, aside from the surface quality, the mechanical properties in the direction of the build, especially the elongation at break and tensile strength, are the most sensitive characteristics to effects caused by material aging. In addition, [PERSON] and [PERSON] [22] researched the impact of the processing time and temperature on the molecular changes and thermal properties of particle polyamide material 12 in SLS.