Prusa I3 Structure Upgrade **beta version**

03-15-15 - End of the assembly and first tests of movement
03-03-15 - End of the modeling of the structure and plastic parts

The original structure of Prusa i3 has many problems of backlash on the axes and must necessarily be recalibrated before each printing.
My project allows for a lower price a printer more precise and easier to assemble.
It is designed for full compatibility with the heated plate , steel shafts and belts purchased for Prusa .
I added two M5 bearings to tighten the threaded rods and reduce the backlash on the X axis.
I have also reshaped the extruder to scroll directly.