We are a little way from 3D Printing being ubiquitous but I am sure that day will come. I am also not sure what form it will take, at least initially. Maybe in a transition state between every home having one (aka Startrek Replicator!) the 3D Hubs concept will be the enabler with everyone in the world having someone like me nearby that will print their stuff for a small fee.
In any case, here is a scenario. You just got your new 3D Printer and it came with a reel of filament. In delightful blue. You promptly order another reel in white but when you get it you notice a problem:
Obviously, I have a 3D printer. But in that future world of ubiquity this could have been me printing the part for something on the printer down the street. Or the replicator built into a cabinet in my new house as they are in most new houses.