## 3 Results and Discussions
### Three-Dimensional Scanning of Sample 1
Since the error PCR was the highest, interaction plots were made again. As the colored lines were associated with levels of simplification, they were plotted against the levels of watertightness. From Figure S3 of the Supplementary File, a maximum severity index (SI) value of 122% was achieved between 50% and 70% and between 60% and 70% for the simplification levels when the lines moved from HW and LW levels of watertightness. Likewise, when the lines of the interaction plot in Figure S3 of the Supplementary File proceeded ahead from LW to MW and from MW to UW, SIs of 111% and 105%, respectively, were achieved, indicating the same cause of a high error PCR and non-significance. Therefore, 3D scanning factors were found to be insignificant with their severe combined effects on the quality of the 3D scanning when the sharpness was ON and the smoothness was OFF. Thus far, the texture scan was employed and the results of the 3D scan have been discussed by keeping the sharpness and smoothness alternatively ON and OFF. It can be seen in Table S2 of the Supplementary File that all 3D scanning factors were found to be insignificant when a non-texture scan was executed for Sample 1 with the smoothness ON, i.e., using mode C of 3D scanning. Of the plot of the main effects in Figure S4 of the Supplementary File, MW and a simplification of 70% were found to be the optimal levels of watertightness and simplification as crucial levels of the 3D scanning factors for minimizing the volumetric error. Moreover, the PCR of simplification was evaluated to be higher than that of the watertightness. However, the error PCR was found to be somehow lower among all the PCRs. Hence, it was again necessary to find the cause of the slightly higher error PCR by looking at the interaction plot. Though the error PCR was marginally higher when compared to the PCR of watertightness only, it was expected that a moderate level of severity of interaction was also present. After seeing the interaction plot for volumetric error from Figure S5 of the Supplementary File, a combined effect of different levels of watertightness and simplification was found with an SI of 35% between MW and UW for line abscissa of 50% and 60%, as expected. Hence, the cause of the moderate value of the error PCR was solely based on this interaction. From Table S3 of the Supplementary File, the 3D scanning factors were found to be insignificant when the non-texture scanning mode and sharpness were ON and the smoothness was OFF (as per 3D scanning mode D of Table 2), with a PCR of watertightness that was higher than the PCR of simplification for Sample 1. A value of the error PCR lay between simplification and watertightness, implying lower and higher values than the PCRs of watertightness and simplification respectively. The error PCR was found to be slightly higher again, as was found in mode C, suggesting a close look at the interaction plots, which usually provide crucial hints toward finding the cause of a higher error PCR. Upon exploring the interaction plot, which is shown in Figure S7 of the Supplementary File, a severity index (SI) of 35.56% was found for almost all the possible interactions between the various levels of watertightness and simplification, as expected from the moderate value of the error PCR in Table S3 of the Supplementary File. This value of SI is considerable, and it indicates that combined effect of the levels of both watertightness and simplification exists with mild severity in the 3D scanning error. This also implies that the error PCR was evaluated to be slightly higher due to this combined effect. Moreover, the main effects pointing toward optimal levels of 3D scanning factors were found to be UW and 70% for the watertightness and simplification, respectively, as shown in Figure S6 of the Supplementary File. Practical Implications of Modes of 3D Scanning for Sample 1  
The dimensional errors were calculated to be minimized by identifying the optimal combination of 3D scanning factors as per the full factorial DOE used.