Very innovative RepRap design similar to delta but much more advanced. It is low cost and highly interesting machine made by Nicholas Seward (high school teacher). I think that future is bright for this printer.
Wiki:
http://reprap.org/wiki/Simpson
Development Forum:
http://forums.reprap.org/read.php?178...
Thingiverse:
http://www.thingiverse.com/thing:104117
https://www.youtube.com/user/nickseward?feature=watch