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One of the issues with 3D Printing has to do with whether the printed object has the internal strength not to break. I recently bought a number of small items from Shapeways to see what the prints were like. They print every object after an order is placed. This takes some time so that the delivery was made a few weeks after the order. Also, I got an email from them after the order saying that one object would not print successfully since it lacked internal structure.

There have been attempts to remedy this situation. Here is an article on work being done at Purdue to create software that will both increase the strength of an object and reduce its mass. The fact that this is a University project says to me that we have a long way to go before 3D printing goes mainstream.
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