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Up yours, would-be magazine-banners!

EDIT: What I probably should have said is: "Molon labe, morons!"
Elle Plato's profile photoAlessio Sangalli's profile photoPhilip Mac Duffie's profile photoSimons Mith's profile photo
Maybe they're secretly invested in thermoplastic manufacturing.
Gotta love that the model is called the "Cuomo."  As I reside in NY, I am unfortunately subject to  Sadly, merely possessing what comes out of the printer is still illegal.

Additional thought: isn't this eerily like the DRM "arms race," where the content providers and the government with their DMCA try to encrypt, but those with motive simply work around it (de-css) and then distribute the results far and wide in order to thwart any attempt at suppressing distribution of that workaround?
I swear, I'm going to have to get a 3D printer...
"Moron" is the wrong term here, as it only implies mental deficiency.  It doesn't cover the element of evil we're dealing with.
We need to get a bunch of us together and start a 3d printing co-op
FTA:  "In response to the upsurge in gun violence...."

WHAT "upsurge?"  There isn't any.  Last time I checked, gun violence is DOWN.

The upsurge is in drone violence.  Obama has personally killed more innocent civilians, more innocent children, than all of America's mass-shooters put together.
+Wyatt Strang, just as one of the most useless things to a pilot is fuel left in the fuel truck, one of the most useless things to a shooter are cartridges left in the box.
+Wyatt Strang The issue isn't whether you need a 30 round magazine - it's whether you are allowed to have one.

Bans on large capacity magazines are a hysterical response to tragic events.  That they should be called for is understandable.  That such bans will not prevent similar tragedies in the future escapes those who call for them.
More people are killed in the US every year with clubs than with rifles. More people in the US are killed every year by being PUNCHED than with rifles. Legislation against rifles is sheer pandering, aimed at exploiting ignorance to get votes.
ter nea
Only cowards need guns.  
I was fortunate enough to have access to several 3D printers at my last job. They're amazing machines. However, the kinds of machines most people can afford (roughly in the $2000 range) will NOT be able to print parts strong enough to be used in firearms. The technology will get there eventually, but as it stands now you need to get a rather more expensive printer to make these parts.
+Terry Neal Then I suggest you live in a country protected by people without guns.

...yes, I know you were trolling. I'm giving you the benefit of the doubt of not being that stupid.

I eagerly await the next round of your troll. This should be fun.
You know, the only really difficult pieces of the puzzle are primers and powder.  I wonder if people are working on that...
+Kevin Partridge
The feed lips in an AR pattern rifle do. The body doesn't have to be terribly strong however the feed lips are part of the body.

+Arthur Shagall
Don't forget the pesky barrel, barrel nut, trigger, sear, bolt, bolt carrier, firing pin, gas key, extractor, ejectror, can pin, gas tube, and so on. All of which are metal.
+Philip Mac Duffie Not really. We have plenty of mil spec, plastic magazines today. It can't be brittle but it doesn't need to be "especially strong." Printing a plastic mag that is effectively strong is a small problem that will yield with current capabilities (as shown by the OP). Printing an effectively strong receiver requires something currently still a little beyond the individual.
As a UKian, I am filled with envy at the US's comparatively liberal (in the proper sense of the word) gun laws.  You think your legislators make it difficult for you?  Spare a thought for your brothers across the Atlantic, who have over the past century been completely Europæanised and all but forgotten what freedom means.
I feel your pain +Edward Cree , I used to live in the People's Republic of Kalifornia.
+Edward Cree I am not sure about UK but in Italy getting an AR-15 is not big deal at all (unlike hand guns); it's classified as a hunting gun so it does not require much paperwork.
+Kevin Partridge
Yes really. What sort of experience do you have with 3d printing? The fdm or sls magazines that are printed are very different than a magpul pmag. Which is the popular quality AR plastic mag. Just because both are plastic doesn't make them equal. Fdm deposits layers of abs on top of one another. The bond from layer to layer is not homogeneous like an injection molded part would be. Sls sinters each layer on top of one another. The materials that lend themselves to this process don't have the mechanical properties of injection molded 6/6 glass filled that a commercial mag would have.

3d printing is a great technology and I have used it myself to rapidly test designs, but there is a reason you don't run production on it.

As far as the lower receiver is concerned it has a far better chance of working in my opinion. The section thickness is substantially greater and with incresed section the layers have more bonding surface area to one another. This minimizes the chance of fracture. The weakest point in the plastic ar receiver would be the buffer tube thread just below the charging handle. 
+Edward Cree
Edward, you seem like a reasonable guy, while we may not be perfect, we have space for you if you ever want to try things out here.

As much as all of us Americans bitch about our country I woulden't trade it for another one. Even today it still has alot to offer. 
+Philip Mac Duffie I think you misunderstood me.  What I meant was, that manufacturing homemade firearms from scratch is not that complicated.  Ammunition, however, is a much more difficult problem, in particular, the propellant and primers.  I suppose it may be possible to work around the need for primes by using electric ignition, but I see no realistic way of making homemade propellant of consistent quality.
+Philip Mac Duffie I have very little experience as a material scientist. I have a lot of experience taking other people's processes and re-engineering them to be appropriate for my purposes. I'm also very familiar with formal research techniques and I'm rather good at estimating how long before someone figures out the right solution within defined parameters.

What was displayed in the OP was a good example of an intermediary step towards a suitable engineering solution. It is not quite this: Direct Metal Laser Sintering - DMLS - By GPI Prototype (which is beyond the home user - for now). 

There are many ways to approach solving the problem you speak about. We are not confined to linearly using what was printed. The immediate hacker solution would simply be to saw off a section of a metal mag and print the lower portion at whatever capacity you desire. Hell, I could cast the upper portion in metal. Maybe an appropriate epoxy coating is the way to go. The proper solution is not dependent upon a linear choice of what materials are "designed" for the process or the tools as specified. 

I also think that you are continually redefining "especially strong" to fit your point in the argument. I mean that the current level of strength necessary to match the strength in current magazines is a small enough gap to cross without a large jump in technology or materials. It does not need to withstand the jarring forces that the receivers need to withstand and it doesn't have to contain the reaction of the propellant i.e. it does not have to be "especially strong." My current magazines make horrible hammers or table legs. I don't think any engineer would consider the tensile strength, yield strength, or impact strength of a standard magazine to be "especially" high.
Magazines absolutely experience excessive forces when the bolt carrier strips a round out of it. Putting most force on the feed lips. I have not redefined strength in any way. FDM and SLS do not produce the same strength of product molded 6/6 nylon will. The section thickness of the feed lip cannot be thickened in this case like a receiver can. Dimensionally that is fixed unless you want to redesign the whole gun.

Print one and try it use your ability to compare them yourself. Test a p mag vs a plastic fdm mag. Metallic sintering isn't even in this discussion. The thing that makes this printed mag significant is accessability. Casting, and machining is possible but it always was. The significance of this story is that it is commonly access able to people without great skill.
I'm thinking the best way to do this specific project would be to make a 3D printed extension to a metal 10 round mag.  The stresses would be much less on the bottom end of things and it can be thickened in the right places without getting in the way of the internal parts or mag well.  Plus you have the benefit of a factory-made, metal pair of feed lips.

3D print the extension, buy a 30 round spring, reuse the existing follower and 10 round body, and maybe even the floorplate.  Easy.
+Dan Bowkley
I agree that will work. I just question the validity of the public fear of this. FDM or SLS guns arnt going to storm the streets like the news media proclaims. The technology is cool no doubt and I myself have exploited it in industry and it is a great development vehicle. I just don't see the sub $3000 table top units turning into overnight factories if the government bans magazines. I agree where there is a will there is a way, all please consider this.

If magazines become illegal. Making one after the ban date would be illegal just like the 1994 ban. If the transfer of a magazine is just as illegal as making one why not just buy one illegally? Its not like either act is a different crime.

I am glad someone has done this stunt to stir peoples emotions and further the idea that taking a thing away will just make people quest onward to have it. 
I think the point is mostly to say "hey don't bother banning this stuff, we can just make it in the living room anyway."

Of course, saying "hey don't ban marijuana, we can just grow it in the closet" didn't work, there's no telling how stupid government can be sometimes.
So this is not all that clever, but it does show very well that people can make contraband in ways so simple as to defy regulation.  But if this is an attempt to make a point, it really needs to be said in a more public way, since I doubt anyone heard it that was not already convinced.

I think it will be more interesting when people start making hybrid weapons, where you buy the barrels and key parts from public sources but print the lower receiver, trigger assembly and magazines to make weapons with new capabilities.  Imagine printing a lower receiver that take motorized drums with hundreds of rounds, or lower receivers that take belt fed ammunition.  The modifications are not trivial to me, but I am sure some clever person is going to see something I missed, and it will redefine personal firearms.
+Elle Plato
If you made a firearm plastic or not the atf already regulates that act and defines what can be made and what part of the work you have to complete. Typically %20 of the work on the receiver must be done by the manufacturer which in this case is you. You cannot legally make anything that is prohibited. You cannot make a machine gun for example as that is a NFA item. If they made the AR15 illegal by a new assault weapons ban you would be prohibited from making that as well. Violating the NFA act is punishable by 10 years in federal prison and a fine not to exceed $500,000. This depends on what you did and how it was done but all atf penalties are severe.

The part of all this that is stupid is by definition criminals dont follow the law. Why do they care that making an AR15 is legal? They dont. Only people it effects are citizens who obey the law. It is a known agenda of this administration to ban modern sporting rifles and they may well be able to do so. Sadly since many guns of this type CAN NOT be imported for numerous reasons the real hit will be to the labor force that makes them. Every single one of them Americans. Its not like we have an employment problem right?
+Dan Bowkley
Well marijuana is legal in Colorado and they don't even know how to sell it yet since it is still illegal federally.

Guns is more complicated in my eyes. The burden of proof is usually on the owner. Like pre 81 auto seers.

It is perfectly legal to possess a pre 1981 drop in auto seer for an AR15, but virtually impossible to prove it was manufactured before then. You also cannot own a pre 81 seer and an AR15 since that is "constructive intent" to manufacture a machine gun which is illegal.

If all of you were not already aware there are MANY laws about firearms. It makes me very angry when the media misleads other to think that individuals can just get anything they want. Since you cannot without of corse committing a crime. 
I must say - why are automatic weapons generally forbidden? It seems to me that automatic weapons are exactly what fulfills the second amendment so that the People has a chance to fight a tyrannical government. If people can only access crippled semi-automatic weapons, the second amendment is worthless. Are there organizations that fight against automatic weapon bans both at the state and federal level?
+Alessio Sangalli
The NRA fought against it in 1985 before the ban, but even they had to come to terms that it was a bargaining chip. Unfortunately because of the ban only the wealthy can own one. The price of a legal pre 1986 M16 machine gun is $18,000-30,000. Depending on what you have.

It will never be overruled as the NFA act is a significant source of tax revinue. Any time a NFA item is transered the ATF gets $200. The owner generally must wait 6-9 months for that to be approved as well.
In the meantime, drones are getting cheaper and cheaper, and people are starting to home-make light-duty ones with small payloads. Once payloads rise to a few kilos, why not put a face recognition system, a GPS and a gun on a drone, and run it with an aimbot from a modern FPS? If you were going to take that route, any old cheapo gun will do, including a home-printed one, because you're not putting your own life in jeopardy if it explodes, just a few hundred dollars worth of commodity electronics. In other words I'm anticipating you people to take an end run round your gun laws, one way or the other.
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