Support for Igus NW-02-17 LLZ rails on Mini Kossel

I had access to 3 rails of Igus NK-02-17 for my mini Kossel. Coming from perfect http://www.thingiverse.com/thing:556178 Self locking carriage, I needed a support for the mini rails. They only have some padding, so they would rotate to much. This support is running around the rails to stabilize, and prevents the rotation.