[Slant 3D] knows a lot about optimizing 3D prints so that they can be cranked out reliably with minimal need for post-processing, and in this short video he uses a cube as a simple example of how a… ...

You can browse both sites to get an idea of what's possible with 3D printers. Once you have a design you're happy with, your computer sends it to the 3D printer, and it starts to build your object.