Z-Axis End Cap for i3

I recently switched out my i3's 5mm threaded rod for an 8mm lead screw. Although I could get by with the original acrylic part, I was missing a bearing.

After messing around with other models that didn't quite fit the bill, I designed these new end-caps to hold my F608Z flanged bearings. I also decided to integrate a keeper in the print to hold the 8mm smooth rods in place.

I built the model in OpenSCAD based almost entirely on the frame DXF found here: http://www.thingiverse.com/thing:3