Posted one up top and heres one while prining a test set of complicated things with small edges and it does no mistake and its fast.
You should really see it in person how good it is as the usual 3D printers you can buy are simple one rail unprecise pinters and much more expensive not to mention half the size of this one.
This is the 5th printer we built and i can tell you from experience i know where it fails so all those small things are corected and thats why it has double rails for stability and it can work faster because its not jerky when sliding X Y axis.
http://s30.postimg.org/mtn77n03l/DSC_0116.jpg