## 5 Discussion  
The different 3D digital technologies used in this work, CT, \(\upmu\)-CT, photogrammetry, microscopy, and 3D printing, offered added value at two levels. First, they improved the scientific process in the study of the object by considerably increasing the number of observations. From 13 cut marks observed with the naked eye, the 3D visualizations allowed to determine 14 others, arriving at a total of 27 incisions. The precise repetition of the gesture suggests that the operator's aim was to recline the integuments. The absence of changes in the axis of the traces indicates a rather self-confident operator, with no resumption or relentlessness in his work. The 6.5 mm long incision may be caused by the operator's final move to recline the whole. Except for the double incisions, the tool used had to be very sharp and fine, such as a piece of rough flint or a chisel. Perhaps the same tool, broken or chipped during the operation, was used for the incisions observed on the posterior face in group B, thus generating the duplication of the cutting edge. Secondly, it opened innovative opportunities in the mediation activity to disseminate the results to a wide audience by proposing a printable model. The use of new technologies, such as 3D modeling of the remains allows us to achieve a long-term protection of these fragile remains [34; 76]. \(\upmu\)-CT presents a real advantage for precise meshes and the study of the state of preservation/internal degradation of the bone. Photogrammetry is useful for texture and microscopy for the study of cuts. Then, the combination of these techniques makes it possible to reinforce the argumentation for the expression of different hypotheses (two pieces of the same bone, traces of work of voluntary decarnation, with several axes of cuts). However and unlike photogrammetry, CT [77] has some impact on DNA, which requires precautions when using this technology on organic material such as human remains. In our case, the state of preservation of the bones did not allow to perform DNA analysis, and the pieces were already been highly manipulated and patched up with resin when discovered in the 1980s. Furthermore, we used low intensity and voltage for both CT and \(\upmu\)-CT.  
We did not use structured light scanners, which sometimes cause distortion problems that are currently being resolved [78]. These are also being tested for the analysis of tiny fossilised elements [79] and we will look at the use of these devices. Lasergrammetry is thus part of our prospects. 3D printing has served as a support for annotations for tracking the study of traces. This use of 3D printing is little explored at the moment, but the routine use of this technology makes it possible to produce easily and inexpensively copies of objects and to use them as a support for sketches, annotations of work under study, such as a draft sheet, with the advantage of a physical 3D representation very easily understandable. These 3D prints are already used to constitute reference collections for education [80; 81] or for particular collections like pathological or paleoanthropological bones [82]. Figure 14 attempts to summarise the contribution of each technique and their combination in relation to the different objectives expressed above. Figure 13: 1:1 scale printing of the bone with annotations. We think that our work on the Beg-er-Vil collarbone validated our approach. However it needs to be applied to many other case studies, in connection with future developments in these technologies, in order to be firmly established in anthropological practices, and in other scientific disciplines involving the study of cut marks or artworks. For the time being, no traces of cutting have been reported with the Teviec cemetery, but rigorous scanning and analysis must be carried out to document this exceptional heritage complex on a European scale. It would be very important to focus the analysis on the kinematics of such cuts and on the existence of any particular funeral traditions.