Rostock (delta robot 3D printer)

Blog with project history: http://deltabot.tumblr.com
Videos: http://www.youtube.com/user/jcrocholl/videos?query=rostock
More pictures: http://flickr.com/photos/jcrocholl/tags/rostock
More details about parts: http://thingiverse.com/tag:rostock
OpenSCAD source files: https://github.com/jcrocholl/rostock
Documentation: http://reprap.org/wiki/Rostock
Ask questions here: http://groups.google.com/group/deltabot

Rostock is a delta robot 3D printer prototype with the following design goals:

Build volume: 8x8x16 inches or 200x200x400 mm
Footprint: 12x14 inches
Print surface: 8x8 inches heated glass which never moves
Mass of end effector with two hotends: less than 150g
Positioning speed: 800 mm/s in all 3 directions
Positioning accuracy: at least 30 steps/mm in all 3 directions
Simplicity: fewer than 200 parts (not including washers, nuts and SMD-mounted electronics)
Hardware cost: less than $500 USD

Inspiration: search YouTube for "flexpicker" or "adept quattro".
Closest ancestor: http://www.heliumfrog.net63.net/deltarobot/delta.html