3D printing is not an exact science yet, please review the Shapeways information and share your results so we can continue to improve the process and the models. We have tried our best to retain the scale of Mike's swords. We have printed several versions and the results have been very good. All of the plastic materials are suitable for toys or painting and fit into standard Lego figure hands. There are some pointy and sharp parts so use good judgement for small children when choosing your materials. The metal materials we have tried are very durable and would make suitable collectibles, trinkets or possibly keychains. Mike actually polished his completed sword to give it more character and many people opt to paint them, etc.