## 2 Materials and Methods  
Both in 3D printing and 3D scanning processes, a vast number of different types of equipment are available. The variety of 3D printing and 3D scanning equipment available on the market has expanded the range of applications and benefits these technologies can provide [34; 35; 36]. Different types of 3D printers vary in terms of printing material, printing accuracy, printing speed, and cost, which makes them suitable for a wide range of projects and industries. For example, high-end 3D printers can produce intricate, detailed objectsusing advanced materials, while more economical options are better suited for large-scale production runs or simple projects. In the same way, the diversity of 3D scanning equipment allows for different levels of precision, accuracy, and speed, making them suitable for a range of scanning applications. For instance, portable and lightweight scanning devices are ideal for capturing smaller objects, while stationary and more sophisticated equipment are better suited for capturing large-scale structures and complex geometries. The different options available make it possible to select the right equipment for a specific task, enabling the best results possible [37; 38; 39]. Figure 1 depicts a diagram of the combination of 3D scanning and 3D printing processes that leads to the final fabricated item, while Figure 2 depicts the use of portable 3D Scanner in scanning a glass artifact in the Laboratory of Non-Destructive Techniques, University of West Attica, Athens, Greece. In this context, the vast number of different types of 3D printing and 3D scanning equipment available provides a great deal of versatility and flexibility, allowing for the deployment of these technologies in a wide range of applications and scenarios. Regarding 3D scanners, structured light 3D scanners operate by projecting a pattern of light onto the object or environment being scanned. The 3D scanner then captures images of the object or environment as the light is distorted by the shape of the object or environment. These data are then used to create a highly detailed digital model. Structured light scanners are typically less expensive than other types of 3D scanners and are well-suited for scanning small objects or parts [40]. Figure 1: Combination of 3D scanning and 3D printing processes that leads to the final fabricated item. Laser 3D scanners, on the other hand, work by emitting a beam of laser light onto the object or environment being scanned. The 3D scanner then captures images of the object or environment as the laser light is reflected off it. These data are then used to create a highly detailed digital model. Laser 3D scanners are typically more expensive than structured light 3D scanners, but they are well-suited for scanning large objects or environments [41; 42; 43]. On the other hand, it is worth noting the fact that errors and measurement problems might occur when scanning objects with the use of transparent materials in 3D printing. When scanning objects for 3D printing, one of the challenges that can arise is the accurate measurement of transparent materials. Transparent materials, such as glass, plastic, or resin, can be difficult to scan accurately due to their optical properties. The main issue with transparent materials is that light can refrac or reflect off the surface, leading to errors and measurement problems in the scanned data. One common problem is that transparent materials can cause distortion in the 3D scanning process. This is because the light used in the scanning process can refrac or bend as it passes through the material, resulting in an inaccurate representation of the object. This can result in the final 3D-printed object being inaccurate or distorted, leading to a loss of detail or fidelity in the final product. Another issue that arises with transparent materials is that they can cause reflections or  
Figure 2: Portable 3D Scanner scanning a glass artifact. shadows that can affect the accuracy of the scanned data.