That type of design uses three parallel arms to control the print head, enabling a device that's not only "fun to watch, " according to the group, but that can also quickly print high resolution objects with a large 9-inch by 11-inch build envelope.
They can be more ornate than you'd expect, however: for a start, you can run multiple app-specific tasks in parallel, such as telling Chrome to search YouTube, IMDB and Rotten Tomatoes the moment you type in a movie keyword.