Kossel Carriage with integrated belt clips for open belts

While I have to use open GT2 belts for my Kossel, I did not like the use of fasteners or clips, so I designed this carriage with integrated clips.

The GT2 belts neatly clip into the grooves - the rest of the carriage is standard from wwchen's adaptation for open belts at https://github.com/wwchen/kossel.