Did a Boolean subtraction with Blender 2.63 to put holes into an object. Exported as x3d file. The problem is; while 10 out of 10 holes appear in Blender, only 9 out of 10 holes show up on Shapeways' rendering. What's going on? Blender on the left, Shapeways on the right
Blender's booleans aren't always reliable. There's a chance there's an issue with this model like a missing face or a non-manifold area that our Mesh Medic tried to fix (and failed). You can check the model yourself with Netfabb. Here's how to use it: https://www.shapeways.com/tutorials/how_to_use_meshlab_and_n etfabb