(a) Illustration of a 3D scan of a part performed with a KEYENCE VHX-7000 digital microscope equipped with a VH-Z20R objective at a magnification of 100; (b) Interior scan of the part and positioning of the lines allowing the extraction of the profiles; (c) Illustration of the angle calculation methodology from a part profile and the sensitivity to the choice of regression intervals on both sides of the bending radius ([300, 2100];[4500, 6600] and [100, 3000];[4500,7700], intervals in µm), the long edge of the sample is located on the left side of the profile. m₁ and m₂ stand for the slopes of the profile.