About this 3D model

Ok I'm writing this all for a second time as I accidentally deleted evrything. Noooooooooooo. This mod doubles the X Y axis’s accuracy on Reprap Mendel. It does this by creating a double pulley system. I have noticed that there is significantly less lash on my x axis now and everything seems to move more sharply. Another benefit is this mod allows your machine to run at exactly the same speed as before. http://youtu.be/vVHvbCfxZdU You can see the first test here and get a good idea of how it goes together. The only difference now is the Y belts brackets have all captured knuts and countersunk bolts.