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Thanks for your suggestion... from a functional point of view it's not really necessary so I assume this is all about adding colour and not by layer as per the color version images provided. If that is the case it would need to be set up as two files and printed on a dual extruder machine... however in that case the bearings could be one colour and the body another. That would be the easiest way to add color. Open to revisions and emailing them to you if you can explain further via a message.