Short video-tutorial by Medialab-Prado with a step by step guide to build your own Thing-O-Matic model 3D printer by MakerBot.
Assembly Instructions:
http://wiki.makerbot.com/thingomatic-doc:thingomatic-assembly-instructions
This automatic 3D printer makes plastic objects based on tridimensional designs. MakerBot hosts an online international community called Thingiverse, a collaborative repository of designs for 3D printing and other DIY processes where users can post files, document their designs, and collaborate on open source hardware. The site is a collaborative repository for design files used in 3D printing, laser cutting services, and other DIY manufacturing processes.