Kossel Double Carriage & Platform

My single carriage was difficult to assemble with traxxas ball joint and the carriage was tilting on the smooth rods.
The platform was designed to fit with this carriage.

It fits with LM8UU bearings.

Designed for Kossel Alt delta 3d printer: http://www.thingiverse.com/thing:154832

I took the design and the files for carriage and platform from there: http://www.thingiverse.com/thing:32000