...Printable area: 200mm dia and 200mm height
Q*Bot is based on commercial Aluminum "L" profile, 25x25x4, which work as structure and linear guides as well. It's steady, fast and easy to build.
Here you can find related files, including Bill of Materials, CAD drawings and all 3D printing objects needed.
It's intended to be an open project: who wishes to collaborate with ideas and improvements, is welcome!
Discussion and other details here:
http://forums.reprap.org/read.php?362,479919