I am sure or I would hope you would just have to deal with degradation of the print quality as the speed overwhelmed the mechanical limits of the printer and things got to shaking. Maybe even start skipping steps. But I would hope not to see any breakage of the hardware. I have another thread where I am trying to compare print speeds with other people and am learning that slicer settings have a big impact on how long a print takes regardless of print speed settings in the firmware. And so a video uploaded to youtube will always be the best way we have to show each other exactly how fast our printers are moving and laying down the filament. I made those videos with my cell phone and uploaded each to youtube absolutely free in the span of a few minutes.