I thought this was interesting. There is a project posted on Innocentive which is looking for ideas on how to produce a 3D printer that is 10 times the speed of current models. The project is offering up to $7,000 for ideas:

The Seeker desires proposals for 3D printing with 10X the speed. The Seeker is particularly interested in disruptive innovations to dramatically increase the throughput of 3D printers.
3D Printing is a rapidly growing industry with a high level of media attention. Projected to be a $10B industry by 2020, 3D Printing can further expand in its market penetration by achieving critical technology breakthroughs in materials and tool architectures. One key limitations of current technology is print speed. While the current 3D printing speeds may be adequate for prototyping, a disruptive innovation is needed to enable wider adoption of 3D printing for end-use parts in industrial applications.
This is an Ideation Challenge with a guaranteed award for at least one submitted solution.
Anyone have any good innovative ideas for such a printer?