Last March we pointed to the RepRap project -- an attempt by Dr. Adrian Bowyer of the University of Bath's Centre for Biomimetic and Natural Technology to design and build a Free/Open Source fabber. In the subsequent few months, Dr. Bowyer and his team have made substantial progress, including adopting a "Meccano" structure for the test unit similar to the Glue Gun Fabricator devised by Vik Olliver; a report by Vik Olliver detailing how to make one for yourself (PDF) can be found at the RepRap website, along with all of the current plans and design reports.
(Via reBang)