## 5 Conclusions  
The Fast-Track-Protocol provides a simple and easy-to-understand workflow, which does not require in-depth knowledge of 3D technologies, to create 3D printed anatomical models of the pelvis and prepare patient-specific pre-contoured surgical plates within 2 days of hospital admission. \begin{table}
\begin{tabular}{c c c c c c c} \hline \hline
**Activity** & **Patient 1** & **Patient 2** & **Patient 3** & **Patient 4** & **Patient 5** & **Mean** & **Sd** \\ \hline
**CT scan** & 25 min & 25 min & 30 min & 35 min & 30 min & 30 min & 5 \\ \hline
**Segmentation** & 180 min & 170 min & 185 min & 195 min & 170 min & 180 min & 11 \\ \hline
**3D printing** & 600 min & 540 min & 660 min & 660 min & 540 min & 600 min & 60 \\ \hline
**Removal of support materials** & 190 min & 170 min & 190 min & 180 min & 170 min & 180 min & 10 \\ \hline
**Pre-contouring of plates** & 35 min & 25 min & 35 min & 30 min & 25 min & 30 min & 5 \\ \hline
**Cleaning and sterilization** & 120 min & 120 min & 120 min & 120 min & 120 min & 120 min & 0 \\ \hline
**Total time of preparing of the model** & 1150 min & 1050 min & 1220 min & 1220 min & 1060 min & 1140 min & 83 min \\ \hline \hline \end{tabular}
\end{table} 
Table 4: Time required to carry out each step in the Fast Track protocol (mins—minutes, h—hours, sd—standard deviation). \begin{table}
\begin{tabular}{c c} \hline \hline
**Advantages** & **Disadvantages** \\ \hline A Do-It-Yourself approach that greatly reduces any potential costs and makes it possible for a multidisciplinary team to create 3D printed models, which can be used to shape and form custom implants & The necessity to learn and implement the entire process of converting CT data, 3D printing, and model preparation \\ Free open-source software for converting CT data and creating 3D anatomical models, with an active community of users and numerous freely available guides and tutorials & Software is relatively easy to learn. However, some users may find it difficult to grasp, particularly in the early stages, if no prior experience of segmenting CT data. \\ CT study protocol that can be implemented on any modern multidetector scanner. & Cost of purchasing a dual extruder 3D printer that has an adequate level of precision and accuracy \\
3D model production using budget desktop 3D & Budget 3D printers can be fickle and usually require regular maintenance \\ \hline \hline \end{tabular}
\end{table} 
Table 5: Advantages and disadvantages of the Fast Track Protocol. **Supplementary Materials:** The following are available online at [[https://www.mdpi.com/article/10.3390/app12073492/s1](https://www.mdpi.com/article/10.3390/app12073492/s1)]([https://www.mdpi.com/article/10.3390/app12073492/s1](https://www.mdpi.com/article/10.3390/app12073492/s1)), Table S1. Fast Track protocol, Figure S1. Select the 'CROP VOLUME' module. Select the area/volume for segmentation (pelvic bones), Figure S2. Select the \"SEGMENT EDITOR\" module. Create two segments, the first segment can be named, e.g., MASK 01 and the second segment, e.g., Pelvis L/R or uninjured, Figure S3. Segmentation correction process (removal of artifacts) using the 'SCISSORS' function, Figure S4. Segmentation correction process (removal of artifacts) using the 'ERASE' function, Figure S5. Segmentation correction process (removal of artifacts) using the 'PAINT' function, Figure S6A-C. Removal of the femur using the 'ERASE' function and 'ISLAND' function, Figure S7A,B. Creating a 3D model for printing. Select the 'WRAP SOLIDFY' function, Figure S8. Select the 'MARKUP' module, Figure S9. Select the 'DYNAMIC MODEL' module, Figure S10. Select the 'SURFACE TOOLBOX' module, Figure S11. Export the model. **Author Contributions:** Conceptualization, K.A., M.E. and P.K. ; methodology, visualization and supervision, K.A., M.E. and P.K. ; writing--original draft preparation, K.A., M.E., P.K. and B.R. ; administration: M.D. ; software, M.E. and P.K. ; investigation, K.A., M.E., B.R., J.P. and P.K. other, M.D.