While this will allow you to salvage some partially competed prints, the interesting application is switching between materials. In the image above, the lower piece was printed in ABS. The print ...
and that includes robotic placement of hardware into 3D prints. Usually this means dropping nuts into parts in mid-print so that the hardware is captive, but that’s not really the story here.
which might be a problem when you have large print jobs. Canon claims a speed of up to 22 ppm on both monochrome and color prints, which was borne out by my tests: I measured it at about 21 ppm.