bobbymike said:Can a 'printed' aircraft be that far off:
http://www.popsci.com/technology/article/2012-07/working-assault-rifle-made-3-d-printer
There's good and bad there.
Good: The *one* part that's been printed, the receiver, is the *one* part of a weapon that the government regulates. You can buy and sell every other part - trigger, magazine, firing pin, barrel, etc - over the counter or over the internet with no paperwork. So by taking the receiver out of the governments ability to regulate, you take the ability to regulate firearms away from the government. And that's a good thing.
Bad: Well, I don't really see anything bad here, apart from lazy journalism. Other than that, most of the gun could be made by a well-equipped home shop; making parts via 3D printing is obviously a new wrinkle, but you can't print up a chamber or a barrel yet. And even when laser-sintering steel and titanium-feedstock printers get good and cheap enough to put one in your man-cave, the barrel will still need to be machined. Unless the printer has *molecule*-level precision.
And printing up ammo is still a ways off.
EDIT: The relavance of all this is that *eventually* 3D printers will be ubiquitous and relatively cheap. Assuming they can build sizable items out of virtually any material - plastic, metals, ceramics, etc. - then probably the major driver of the cost of a printed item will be the *mass* of the item. Secondary cost will be any wacky, rare feedstock materials. The actual complexity of the printed item will be almost irrelevant. And thus a small turbojet engine massing 25 kilograms won't cost any more than a small piston engine or a steam engine massing 25 kilos. And thus horribly complex componants won't cost much if any more than simple components. Couple that with a governmental inability to control what people, corporations, religious organizations, militia groups, chess clubs or teams of LARPers may choose to print up, and the future skies may be filled with home-made aerial hunter-killers.