I created a small video tutorial on how to create a very basic container (a box and cup) using makerware. The 3D files are a closed cube and cylinder. In the video I use the advanced settings in makerware to print them with no fill and no roof, resulting in an open container.
You can view the tutorial here: http://youtu.be/1iRlVtrrdow
If you enjoy this video, you may also be interested in the Blender for 3D Printing DVD that can be bought at the blender.org e-shop (this video is not on that disk, but is in the same style).