Install the cable chain without replacing the carriage. http://www.thingiverse.com/thing:1066680
This is my solution to attaching a cable chain to the ROBO 3D R1.
Warning! Some ingenuity and basic electronic skills required.
You will run into obstacles when installing this new carriage.
Removing the bearings from the old carriage into the new one can be tricky. I taped them out with a hammer and screwdriver (The handle needs to be able to fit through the hole in the carriage not the bearing.
If the bearings do not fit snug do not worry. Just add some tape around the bearing until it fits tight.
I hope you find this useful and as much fun as I did!!!