One thing to consider is how many 3D printers really exist. The 2012 predictions were based on MakerBot selling printers, but it soon allowed the basic design and programming to go OpenSource and millions of printers were built from kits or scratch that weren’t sold by any company in particular. I bought two myself from eBay. In general, the whole concept of people making things for themselves rather than buying is where COVID-19 will come into play. It will take more than a couple of years to teach people the rewards of self-made lives, but this kick to the economic head may jump start local economies that some of us have been trying to nurture since the PeakOil ‘90s.