For those that are interested, you can make your own 3D printer at home using designs or kits from here...
http://fabathome.org/wiki/index.php?title=Main_PageA full kit costs about $2000 (still a cheaper option).
You can design to print in almost anything. Some have printed in chocolate, cheese, wax, soft plastics and even using melted sugar.
Sadly the accuracy of the home built one is no where near the level of precision found in the $20,000 3D printer, but it's good enough for most home/experimental uses. The process is also very slow and the scale of the $2000 kit is rather small (objects have to fit in a 8"x8"x6" area).
Of course, the design is pretty open so you are free to alter it as you like. I don't think it would be too difficult to double or even triple the printable area. Remember, however, that the larger the printer area, the longer it will take. Small projects can take days. A large one could take a week or more.