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Due to feedback received, I am not sure this model is suitable for production in Shapeways' plastics. I've closed sales of this version of the set, please contact me if you are interested in alternative solutions.
This is a set of ratchet joint plates to replace the ones inside the hips on Combiner Wars Optimus Prime and Motormaster, and should allow them to pose more more comfortably, with twice as many positions as the original design. You only need to replace the piece that is attached to the frontal thigh plate, you should be able to keep using the other original piece.
UNTESTED by myself, based on feedback from beta testers I've made the pieces thicker than the original version.