Future: could we use 3D printing to tinker our computer, phone? (video)

I'd say personal 3D fabrication will probably be at least as proliferated (probably more so) than woodshops are today. There are certainly pretty big barriers to padding electronics in the home. Case mods, etc. - it's already here.

Silicon lithography is probably not going to be in home within 20 years - but perhaps modular open source electronics like the Arduino will be so ubiquitous that hacking electronics is far less fab and more plug-and-play.