About this 3D model

This was my prototype: http://www.thingiverse.com/thing:9187Version 2 reduces plastic and print time and cleans up spacing. It works but is by no means long-term tested. My bot does not seem to have any issues with binding at the top like it used to. I am using only one of these things on the right side, the other side still has brass press-fit bearings.The Z-Axis follower is designed to be inserted into one or both sides of the z-axis ToM where the press-fit bearing would go in-between the top and bottom z-axis pieces.The goal was to make it fit inside the regular z-axis constraints and require minimal modification to the z-axis (now only 2 screw holes).Original Sketchup file included for whatever modifications people want to make.