Help diagnose Z-banding
This differs from the traditional banding as observed from Z wobble induced banding as e.g. explained in this answer.

Your banding patterns clearly seem to form diagonal bands, this is most probably a combination of the lead and the full rotation of the stepper. The most logical explanation is that the layer shifts as a whole in X-Y direction (when seen against the print height, this movement is concentric seen from the top). This means that the next layer is positioned over the previous layer in a concentric pattern. This hints to some sort of defect in your X/Y-plane assembly and should be investigated further. 

This is difficult to visualize, but this sketch shows the issue for some layers:



This could be related to the belts of the X and Y-axis, play on the drive pulleys, non-straight lead screw, guide rods with play, play in general, Z-stepper alignment to the threaded rod, etc. Considering the amount of Z-wobble fixes shared by the unofficial MP Select Wiki, the best place to look for is the Z-stepper to lead screw coupling.