A single breadboard is great when prototyping with a microcontroller and a couple of small DIP packages. And the wonderful, little 5V/3V breadboard power supplies definitely help keep the project organized. And with breadboards that snap together, expanding is definitely possible.

But needing to move the project from one workspace to another is a recipe for breadboards separating and countless connections needing to be mended. Coupled with a growing number of projects that also need multiple voltages or multiple power supplies for servos and stepper motors, decided to "design a better mousetrap".

More information on building can be found on thingiverse.