## 4 Discussions
\begin{table}
\begin{tabular}{c c c c c} \hline \hline  & **Durability** & **Software Processing** & **Pricing** & **Build Size** \\ \hline Poly-jet & High & \begin{tabular}{c} Relatively complex (time-consuming, \\ requires high computational power, \\ stepwise planning) \\ \end{tabular} & 10X & \
\begin{tabular}{c} \(255\times 252\times 200\) mm \\ for Objet 260 Connex3. \\ 342\times 342\times 200\) mm \\ for Objet 350 Connex3 \\ \end{tabular} \\ \hline Binder-jet &
\begin{tabular}{c} Relatively \\ fragile \\ \end{tabular} & Relatively simple & X & \(250\times 380\times 200\) mm \\ \hline \hline \end{tabular}
\end{table} 
Table 1: Durability, software processing, pricing, and build size comparisons between poly-jet and binder-jet printing. Another common method to color a digital model is known as \"UV mapping,\" where a 2D image is projected onto a 3D model. The surface of the 3D model, however, must be \"unwrapped\" and a 2D image overlaid, thus becoming mapped onto the 3D surface model [25]. This approach is widely used in character modeling, gaming, and 3D animation worlds as it allows for intricate texture while keeping polygon numbers low. It allows for texturing the planes of the mesh, rather than just the vertices. However, UV mapping is not suitable for coloring biomedical data-driven models since they possess a high number of vertices with complex structures that make it especially difficult to \"unwrap\" and flatten into a 2D plane. Simplifying the model by reducing vertices would come at the cost of anatomical accuracy and should be avoided as much as possible. When 3D-printing colored models with UV mapping, the desired output is a VRML file, which was long associated with sandstone printing. Interactive virtual anatomy models were created with the use of 3D modeling and realistic UV wraps. [PERSON] et al. reported the production of an interactive web platform \"Virtual Anatomy System\" based on high-resolution anatomical images of the Chinese Visible Human dataset with segmentation through Photoshop and 3D reconstruction through modeling and animation software Maya [26]. Commercial applications such as Complete Anatomy [27] and Visual Anatomy Lite [28] feature realistic 3D models of human anatomy that were UV wrapped. Such models are \"digitally modeled\" in modeling software such as Maya and 3D Studio Max and wrapped with a painted UV texture [29]. It is important to note that, while these models may heavily reference biomedical data, the 3D surface models are manually created rather than directly utilizing vertex points computed via 3D reconstructions. Our study seeks to introduce a method of producing colorful anatomical models that correlate directly with biomedical data and minimal artistic intervention. There are several sensible reasons why tangible, physical models derived from biomedical data and enhanced with multi-color landmarks are valuable tools for students. Firstly, an individual no longer needs to project 2D landmarks derived from textbooks onto a 3D mental model. Often, students must put together several 2D illustrations showing multiple views to accurately place the feature on a monochrome, 3D bone specimen. Secondly, the ability to show right and left anatomy, with color enhancement, can reduce confusion. For example, a student need not imagine a mirror model of the 2D illustration for the left femur if both models are present. Thirdly, colored features can also serve as landmarks to which instructors refer for speedy communication in the classroom. Finally, this coloring method defines the edges of each feature, which are not clear using monochrome methods. Students may look to these models for practical study guides. [PERSON] et al. developed color-coded physical heart defect models after separating different colored parts via segmentation. These were used in a premedical human anatomy and physiology class with groups divided into virtual and physical models and subdivided into those with and without colors.