Center Test pattern

Being who I am, I rarely take anything for granted. Thus most subjects and technical even other stuff gets a 2nd, 3rd or even more questioning to verify the correctness or truth there-of. Having now assembled two 3D printers from different sources I found that the "auto homing" location differs radically between the two. Just to make things really interesting I checked the positions of the nozzle and auto level sensor relative to the center of the build bed. In one case the auto level sensor was closer to the physical center of the bed whilst in the other case the nozzle was closer. mmmm interesting that? This prompted me to create a simple test object to test the "real" "Printing" center of each printer taking into account the fact that CURA 3.0.4 places an object dead center according to the machine definition. The results are quite interesting.

Just a note to indicate that some makers commented that knowing the exact center is or even approximate center is irrelevant I just