Have a look here - it's a bit non obvious, but under the Objects listing, there is a Cartesian Bot 1.06 zip file - in there are some .step files, including one that has the entire assembly.
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sourceforge.net]
Not sure if Rhino can deal with Step files, but I've loaded it successfully using the free versions of CoCreate and Alibre. The parts count prevents you from saving changes with the free versions though.
Ed designed them with Solid Edge I believe; I think the original Solid Edge files are in there too.
Wade