## 5 Discussion  
Given that it is a prototype device for measuring adhesion to print beds and the values of standard deviations of the measurements, it is evident that its operation is not flawless. Therefore, the concluding discussion revolves around evaluating the prototype's functionality, advantages, disadvantages, and potential enhancements aimed at improving the efficiency, precision, and user-friendliness of the proposed device. Based on the presented results, it is clear that the device performed adequately in all 48 measurements conducted. The complete force-displacement curves were recorded, focusing on the maximum force at detachment. In terms of the subjective opinion of the authoring team regarding the prototype device's use, several specific advantages can be highlighted:  
* The requirements for compactness, i.e., the small dimensions of the measuring device, were met. The prototype's placement was tested on various types of FFF devices, including Creality CR-max, Neo V2, Ender v1 and Pro, Prusa MK2S, and MK3S+, among many others. * The device's positioning and the sensor's location at the center of gravity ensure detachment of the model perpendicular to the print bed, ensuring a relevant and repeatable result. The construction of the device is designed in a way that its attachment to the model other than at its center of gravity is not possible. * The frame of the device is stable and significantly overdesigned despite its dimensions. This ensures its sufficient stability and prevents any negative influences from affecting the test results. * As previously mentioned, the device is designed to be as intuitive as possible in its placement and utilization. Its design prohibits its use in any alternative manner. This discussion serves as a critical evaluation of the prototype's performance, highlighting its strengths and areas for potential improvement to further refine its functionality and usability in adhesion testing to print beds. During the prototype usage, several drawbacks related to its structural design emerged. The measurement process used for verification proceeded smoothly. However, the only observable drawback was the optimization of the printing process for PETG material models. PETG models tended to detach relatively frequently from various types of print beds, necessitating constant adjustments to the FFF device's process parameters. An illustrative example of a detached printed model can be seen in Figure 8. Among other drawbacks of the prototype, the following can be highlighted:  
Figure 7: Comparison of maximum forces when detaching the bed with PEI and PI coatings. * Inadequate stepper motor performance or improper gearing under extreme surface adhesion. When treating the print bed with adhesive agents like acetone and ABS solutions or silicone-based preparations, which significantly enhance adhesive properties, instances occurred where the adhesion became so extreme that the stepper motor lacked sufficient power to separate the model from the bed without damaging it. * Substitution of materials in certain key components. As it is a prototype, some of its components were manufactured using FFF technology with ABS material. Minor flaws arising from the plastic construction can be rectified by replacing them with metal alternatives. * Modification of the device's transformation mechanisms. Swapping the trapezoidal lead screws and nuts for larger diameter alternatives would enhance the device's operation, improving its stability and reducing the risk of slippage in cases of insufficient stepper motor power. In conclusion, despite the functional operation of the prototype in conducting measurements for verification purposes, several shortcomings related to its structural design surfaced during its practical usage. The measurement procedures proceeded smoothly, yet the challenges in optimizing the printing process for PETG material models remained apparent due to frequent detachment issues.