I am so very confused..... Couldn't he just of used a CMC machine and made it out of steel with no modification what so ever? Why make something out of plastic that should be made from metal.
That said it is interesting and good work.

10 years from now when this tech is in everyone's home.... how on earth are the normal non-gun totting parts of the world going to stop rogue 'gun plans' getting into everyone's hands.... like 12 yr old kiddies printing themselves a nice new toy!

Even though the gunpowder in the batman shooting case is still fresh someone has the audacity to give people ideas to print out child murdering weapons.
Now every anti gun acvocate will come out of the woodwork calling for a ban for all 3d printers.
@Michael Mantion : The fact that 3d printers are much cheaper than full blown cnc machines and tough polymers have been used extensively in the firearms industry signifyies that 3d printers are becoming more attractive means to discreetly manufacture firearms. It is now possible to make a fullblown working assault rifle given you have the files and machine the metal parts somewhere else and no one would know.

@JPAR - 10 years from now? You're kidding right? I can bet in less than 2 years you'll have software running on an iPhone interface that allows you to select and print a gun to a sub 1000 dollar printer.

JPAR, one could argue that the "normal" gun toting parts of the world are actually "abnormal"!
If a 12 year old has the wherewithal to create a functional firearm using a CAD model, they may very well be the next great inventors of their generation.
That being said, the Feinstein's, McCarthy's, and Brady's will probably go ballistic over this!

So just remember, order those upper receiver assemblies, now, before someone makes them illegal for mail order.

Only government could stand in the way of the full potential of this break through technology (Open source 3D Printing), which has the potential to massively expand wealth creation by the mass of people.
Again, only government can destroy this, and if it happens, it will all be under the guise of "public safety".

As a laser-cutter programmer, I tipped off the cops a few times when I thought the parts I was programming looked a bit gun-like.

3d printing of guns has been covered for over 18 months on the internet. I have been following 3d printing as have many people. the idea of doing it with guns and weapons generally has been around for some time.
while weapons are interesting in some ways, particularly because they can be illegal to obtain in the public realm but possibly to 'print' privately at home----the reality is that there are plenty of great weapons to buy that will perform far better and more reliably than something made of plastic, or pieces made of plastic.
that said PROTOTYPING weapons is expensive and 3d printing for prototyping speciality weapons or weapons modifications for BETA testing at low cost could be a real money make for people in this area who are willing to work with local armories and gun shops, or , if they make it big, with arms manufacturers and sports equipment manufacturers.
HOWEVER. when it comes to moving part machines, there are far more interesting applications for 3d protoyping than weapons. how about engines, motors, pumps, windmills, hydraulics, suspension, the list goes on....

@Truepatriot Constitution
Joe Mc Carthy would likely have loved something like this. His goal was to purge the US Government of communist infiltrators. He wasn't after communists in Hollywood, despite the constant lies about him that the movie industry and the media keep repeating.
Look up the Venona Project. that was intercepting and decoding communication between the Soviet embassy in Washington D.C. and the USSR. Venona was declassified in 1995 and the decoded documents released revealed Mc Carthy was right and there were even more Soviet agents in our government than he had found. There's still a huge amount of intercepted communications from Venona that have never been decoded. The leftists in our government got Venona shut down to cover their butts so they wouldn't end up in prison for treason.
How about Venona@Home to decode all of the Venona documents?