I took a few different designs based on the oem robo x carriage. It is mostly based of this: http://www.thingiverse.com/thing:1411833 and the tslots for the fan shrouds are the same dimensions. I used the chain link dims from this: http://www.thingiverse.com/thing:696183 The slot heigt on this carriage should accommodate e3d v6 heat sinks. From the drawings (6mm groove) the carriage is 5.9mm thick so, it may require some finishing but, the heat sink needs to fit snug anyways.
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