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This is not your Prusa Mendel. This is the Godzilla of advanced industrial 3d printers, a hybrid metal laser sintering and high precision milling machine.
It can produce highly precise medical and dental implants and high end custom aerospace industry parts. The structures can have intricate internal structure that can decrease weight, improve cooling or add advanced structural properties.
Lumex Avance can also print complex molds and casts with integrated cooling for high cycle injection molding.
Typically, milling produces debris, or chips, of removed material that vary in size. However, the LUMEX machine utilizes dry cutting, meaning no coolant is used. For this reason, the cutters are very small and the machining metal removal is a fine powder. Thus, the porosity is theoretically equal to the particle size of the powder and gets incorporated into the powder mix. Usually, no removal of milling chips is needed.

Some attempts at DIY laser sintering from 2010 with a 250mW laser, plastic powder and thermo-gel. It was noted that 1kg of powder costs about 3-5 Euro and 50ml of gel cost about 5-6 Euro. Since then some advancements were made by other in the field., but it is interesting to see early experiments.

Video covers the broader goals of this research, namely the fabrication of vascular structures from sugar glasses for a rapid hydrogel casting process to create vascularized synthetic tissue.
Source:

http://opensls.tumblr.com/post/60147322561/id-like-to-share-my-final-presentation-as-a

Update:

http://www.andreasbastian.com/opensls/

SOLIDICA (Ultrasonic consolidation of metal sheets with integrated wiring)





POM (Direct Metal Depostioning - metal powder spray laser sintering and coating)






ARCAM (Electron Beam Melting)




Via:

http://www.youtube.com/user/manufactureornl/videos

There is a research underway as part of Rice's Advanced Manufacturing Research Institute (AMRI) to create open source SLS printer. It is done by Andreas Bastian.