Fabbaloo had a post a while back on 3D printing batteries. I simply can not believe that I missed it! That was kind of the missing link to my “make your own ipod” project. Circuits are possible and this means that your electronics are the housing. If you can then spread a battery out over the circuit/housing you could see some real fun with changing designs & form factors.
While the first two posts are all about dreaming of the future Replicator takes us into the past. With two 60’s desktop manufacturing tools that allowed kids to make toys.