If you're interested in open source 3D printers, then you'll like these: http://www.reddit.com/r/reprap http://www.reddit.com/r/reprap http://reprap.org/wiki/

If you're interested in open source 3D printers, then you'll like these: http://www.reddit.com/r/reprap http://www.reddit.com/r/reprap http://reprap.org/wiki/Main_Page http://reprap.org/wiki/Main_Page http://openfarmtech.org/wiki/Main_Page http://openfarmtech.org/wiki/Main_Page (Not quite 3D printer, but on the 'rebuild human cilization' level)