Again from Impro Guns, we get an example of a homemade firearm. 3D Printed Submachine Gun (Brazil)
This one seems to be a variation on the Professor Parabellum open-bolt submachine gun. It resembles the venerable Grease Gun from WWII. Click thru for the photo.
Not all of the gun is 3D Printed. The barrels of these guns are typically made from hydraulic tube. The breach and bolt from round bar stock, or steel bolts, and so forth.
This example appears to be 9mm, with a folding stock and a vertical foregrip. It also sports a red dot site on a Picatinny rail.
The Professor Parabellum firearms are not new, even if 3D printing is. Most of them can be constructed by your average shade tree mechanic, with a few of them requiring one or two machined parts, usually lathe-turned parts. Most require nothing more elaborate than a drill press.
One of the things 3D printing has produced is a way to rifle a barrel by way of electrochemical machining. Even if building a sine bar rifling machine is also with the capability of most weekend mechanics. Sine bar rifling produces better results, or it can anyway.
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