Earlier quoted context omitted.
If OP is selling via Shapeways, it's printed and shipped by Shapeways in the user's choice of material. From the link, it looks like the only option for this one is Nylon, but that's about the strongest plastic you can get for things like gears.
Not necessarily suggesting it for this, but for anyone not used to shapeways they have a wide range of materials, with plastics of different types, metals (I have silver wedding rings I got printed there) and ceramics. I think sellers may be able to limit the materials to known working ones (each material has it's own requirements).
was it to save money? or for some unique design?