MIB Galaxy on Orion's Belt. requires a marble no larger than 14.75mm. Shapeways has changed the printing rules once again and this model is no longer printable in silver. If you want it in silver, please click on the following 2 links. This link is for the upper section in silver. http://www.shapeways.com/model/837058/mib-galaxy-on-orion-s-belt-upper-v2-for-silver.html?li=my-models&key=bf3a66aab1272f3b60f51ba22e52119f This link is for the lower section in silver http://www.shapeways.com/model/837055/mib-galaxy-on-orion-s-belt-lower-v2-for-silver.html?li=my-models&key=31eb0415b5c2a513a2fc679096e04f9a