I've got a very simple design that I'm trying to get in the ceramic option. I have tried to remain within the restrictions Shapeways lays out for Ceramic guidelines, but I can't for the life of me get my design to have the ceramic option. I'm uploading here to see if anyone can help me. I'm very very new to 3d design and Have just been trying this in sketchup. Thanks for any help and please let me know if I can upload in another way to make it easier for people to view.