Yet Another Prusa i3 X Stop

Yet Another i3 X Stop. This is a remix of http://www.thingiverse.com/thing:482389, although I redrew it completely in SketchUp. I added a rear clamp to prevent it from moving or coming off of the smooth rod

EDIT: I've added variations of the front and rear stops to accommodate different X-Assemblies and Extruders. The original was designed for Greg's Wade Extruder on my custom X-assembly (http://www.thingiverse.com/thing:1799972). After changing to E3D v6 Compact Extruder for i3 Rework (ht