Rereading the original post, if you were to make a sculpture by hand out of clay using the renders as the "model", I wouldn't think there would be a copyright issue, as the orignal mesh isn't used to create the 3d version.  However, it  would  be different if you carved it out  or made molds using a CNC machine or made one via computerized rapid prototyping.

 As Jen says, if in doubt, ask the vendor.

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