# Creating a Haptic 3D Model of Wenceslas Hill in Olomouc
## 4 Discussion  
The resulting 3D haptic model was created in the scale of 1:1000, which was influenced by several factors. The dimensions of the print bed of the Craftbot FLOW IDEX XL are 425 \(\times\) 250 \(\times\) 500 mm, which resulted in the need to limit the size of the printed model so it would fit on the bed. It would potentially be possible to print a larger model composed of multiple parts which could then be joined together. However, this would lead to an increase of total print time. Even in the scale of 1:1000, the total print time was roughly four days. If the model were enlarged by a mere 10%, the time would significantly increase. The dimensions of the model were also influenced by the number of interactive elements. Theoretically speaking, the model could contain more than eight elements, but to provide enough insulation distance between each element, their number was limited. The size of the tablet computer was also taken into account when deciding the scale of the final model. The resulting haptic 3D model has several issues, unfortunately. The conductive Protopasta PLA, used to print the conductive part, suffered from an unwanted trait of leaving marks on the non-conductive white part. Since black and white are contrast colours, the mixing of the materials was visually obvious, fortunately without any functionality limitations. If the non-conductive part were printed using a different colour filament, these visual issues could have been alleviated. Another issue of the model is its technical shortcomings. The tablet computer needs to be placed in a very specific way without being manipulated later. The conductive elements also have to be in direct contact with the display of the tablet. If the model is then moved in any way, the intended functionality could be prevented. These shortcomings can be solved by a more precise modelling process and by pressure using foam material. On the other hand, the presented solution has several advantages when compared with similar products, such as the model of Kromeriz Castle, created at the Department of Geoinformatics, Palacky University several years ago [42] (p. 110). The model also uses a tablet computer to present additional information upon touching a conductive part. However, about half of the display was covered by the model limiting the display potential, which is not the case for the haptic model of Wenceslas Hill. Here, only a small part of the display is covered by the model, providing more space for text, images and other forms of media. If some modifications were made, e.g., making the model larger or providing a different solution for connecting the tablet to the model, it would be possible to use a larger device to display the information. Similar to [20], the contents of the web could even be transferred to a much larger screen (e.g., monitor, TV) to display more information. Currently, the web is set specifically for the resolution of the device used. However, as the web uses CSS, multiple breakpoints could be set to control the layout of the content on larger displays. The styling and overall presentation of the web could be improved as well. Contrary to the solutions presented in [17; 31; 37], the haptic 3D model of Wenceslas Hill does not rely on internal electronic components for its functionality and as such is easier to produce. In other words, no additional parts are needed for the intended functionality, as an electrical signal transfers through the conductive filament without any additional components. However, a device is then needed to interpret the signal, thus the presence of the tablet computer, which is in direct contact with the conductive parts. The need for a 3D printer with multi-material capabilities or dual extrusion could be seen as a drawback. On the other hand, the model is otherwise relatively cheap to produce. As the model itself does not rely on any additional components, it is easily replicable and its principles applicable to any other 3D model.