I've created a .wrl file using a program called NetLogo3D. I'm using Linux, so I am able to view the file in 3D with no problems whatsoever using whitedune. I feel like my file fits all of the guidelines, but it is unable to upload to the website because of a "Calculation Error." It obviously couldn't be fixed automatically, nor could it be fixed via the manual fixing process. I emailed the Shapeways team, but they couldn't even open my file. So, not only was it not fixed, no actual problems were reported, so I am clueless as to what I need to do. If you all could help me out at all, it would be GREATLY appreciated. Thank you in advance!
It looks like your model comprises of many shells that are saved as a group of objects. You can have a many shell model, but the shells need to merged into into one object.