## 3 Results  
As a result of conceptual work, the developed technological workflow was modeled in the form of appropriate UML notations. To develop the UML diagrams, we used Sparx System's Enterprise Architect software. The environment allows for project documentation for IT solutions in various methodologies and standards. As the reference for preparing the UML activity diagram, we practically implemented the assumptions presented in Section 2. After performing a series of laboratory tests with a total station and examining its station stability, we decided to describe the entire technological process, divided into individual stages, in a standardized form. The modeling process complemented the research work, ensuring the repeatability of the process and transferring it successfully into a fully web-based environment. Regarding that, it became necessary to automate the approach according to ISO standards [30, 31]. It seems to be crucial considering the quality control of the production process. Notably, the consistency of operations is essential in Industry 4.0, so there was needed to develop unified and standardized manufacturing [32]. What is more, the modeling process itself was the subject of scientific research. Further, the service includes the following components: a database, a dedicated application, and a 3D printer. The printing service ends with covering the newly produced total station housing with the hydrophobic coating. In the last phase, the product is delivered to a client. The initial UML diagram is presented in Figure 7.  
Figure 5: Detailed view of the printed instrument housing prototype; (**a**) visible 5 mm-broad gap between the covering layers and (**b**) protective roofs mounted above the aiming holes. Figure 6: View of the protective housing’s elements: (**a**) the profiled pad placed beneath the instrument’s tribrach, (**b**) unique front and rear aiming sights enabling the orientation. Compared to the general sketch already demonstrated in Figure 1, the workflow run is now coherent with Geographic Information Standards ISO 19100. The procedure refers, then, to the role and relation classes of the service client/contractor on the dedicated printing website (Figure 8). Finally, a coherent data model is established, as demonstrated in Figure 9.  
The modeling process was verified in practice by referring to the following procedure:  
* The preparation of a housing prototype for laboratory test stand according to Figures 1 and 7;
* Quality control of the 3D printing product;
* Accuracy test of the total station covered by the unique housing in a surveying lab. The validation test was performed by utilizing the infrastructure of The Military University of Technology in Warsaw, Poland. The instrument setup took place using a concrete pillar with forced centering (see Figure 6a), as the surrounding selected 7 target points (Figure 10a) were marked by precisely manufactured steel ball prisms with a reflective foil (Figure 10b). We assumed that both horizontal and vertical angles observed by the total station should be diversified to consider a random deployment pattern of the control points. Figure 7: UML diagram formalizing the initial manufacturing process. Figure 8: UML diagram formalizing the enclosure printing website. Figure 9: Conclusively formalized data model compliant with ISO 19100. The ball prisms of such kind are mostly used for precise surveys, especially for structural monitoring purposes or laser-tracker applications [33]. Using such precise targets significantly reduces or even eliminates most of the systematic and personal errors [34]. The target distances varied from 4.029 m to 8.299 m. The instrument covered by the new manufactured housing was then run in a continuous surveying mode using Leica GeoMoS as the total station steering software [35; 36]. Precise point targeting was executed by utilizing an ATR mode, as already explained. Figure 11 presents a schematic sketch of the measuring process.