Also, the raw material is expected to be quite rare relatively soon.
To be fair, this wouldn’t be nearly as true if we had persisted with our original plan which was to reprocess the spent fuel, more than 90% of which is still usable material. Once we found a couple huge deposits of Uranium, it became much cheaper to simply mine more of it and dispose of the spent fuel, so the recycling plans were scrapped. Sure, we can technically still pull the spent fuel back out again and recycle it, but we spent many years building reactors without building an equal capacity of reprocessing facilities (which are almost as hard to build safely as reactors), so that ship has more or less sailed.
3D-printed shoes could be a great idea given how different everyone’s feet can be. It could save on transportation and logistical costs, and everyone could have shoes perfect for their feet, created much more locally than Vietnam.
However, the cynic in me says that’s not what Nike is doing, or why - they’re doing this because it lets them cut workers. Traditional shoe manufacturing involves human hands at many process steps, often with machine assistance or other tools. This lets them cut out all of those workers and all of that equipment in favor of one machine that makes an entire generic shoe for them to shove onto shelves next to all the other generic factory-made shoes. This is not the future.