This is my attempt to build direct extruder for my own CoreXY (with HBOT belts) 3D printer 
Beauty of Simplicity - I like it!
Looks good. I like the idea of having the nema between the rails. Does it fit to a prusa i3? What is the distance between the rails?
A nice simple design such as this is harder to design that a complicated one. Like it.
@3D-Proto ​ no, it does not fit on i3 due to collision between nema and X belt 
My smooth rods distance is 57.3 mm, i3 has 45 mm.
where are the belt
@serge_fredette There are no belts on photos in my post. But you can see them here https://lh6.googleusercontent.com/-YF-G28sAscw/VGNAlzoPYeI/AAAAAAAAbMo/JChx69eYYaY/w466-h621-no/IMG_20141112_121145.jpg
ok i have wide enought on mine but the belt is in the middle