I made a couple of pendant designs in Adobe PhotoShop and then make them 3D with the Image Popper on Shapeways. But now I need to add an eye for the necklace chain to go through, which faces the opposite direction of the face of the pendant. I have minimal experience with Google SketchUp, but it looks like SketchUp doesn't work with the Shapeway files. I don't have any other 3D software. Any suggestions?