I get carried away when I watch videos and read articles about 3D printing, and often fantasize about having my own 3D printer at home. Today I heard about the RepRap project, which aims to make a 3D printer that can print most of its own replacement parts, thereby allowing you to print printers. One of the first things that came to mind was updates.
With software, we have gotten used to the download-and-install process for handling updates, but with an ongoing hardware project, things get more complicated. Since RepRap printers make their own replacement parts and represent an ongoing project too, it would be possible to have them download updated specs from the internet and print out the new parts, but you would have to know how to attach them yourself. That's a bit more trouble than software patching.
Mokalus of Borg
PS - I'm not sure exactly what percentage of its own parts a RepRap can print.
PPS - If it's just the plastic bits holding the metal together, it's not much.