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Shapeways

Works Sculpture DigitalSculpture 3dPrintinghttp://www.shapeways.com/tutorials/how-does-shapeways-work
1. objects must be closed.
2. objects must be manifold.
3. observe the maximum size and wall-thickness. (2mm)
The maximum size of your object and the minimum wall-thickness depend on the production method that you are planning to use. Please see our full Material Overview for more information.
4. correct normals.

http://www.shapeways.com/tutorials/exporting-from-blender