America’s 3D Printed Gun Problem Is Getting Worse and Spreading to the World

You make a good point. It does remind me (to some degree) of what happened with ripping music and scanning books.

Best of lucks!

Hope you get better

Sending love!

As someone that has learned FreeCAD/slicing/printing and someone that can set feed, speed, and sizzle bacon with a side of chips, I'm not as proficient/experienced with machine tools as I am with design and printing, but for the time I've spent doing both, the total learning curve is about equivalent in my opinion.

See, the thing is, with 3d printing functional stuff, you can't just grab a file and print like this. It sounds plausible in theory, but it is honestly a recipe for a Darwin award when handling tiny explosives (primers technically are) like ammunition for firearms. This can be difficult for many people to grasp, but consumer 3d printers are accurate, but not precision machines. This constraint of accuracy without precision is important. In the most basic explanation, the movements of the printer begin by assuming a 0 (x) and 0 (y) position. All movements assume they are relevant to this 0,0 location and absolute. There is always variance in this 0,0 location.

If you get deep into the weeds, there are also several factors that make every 3d printer's motion system unique to where two files will never print exactly the same between two machines. It does not matter at the tolerances of most parts people share, but this is usually at least 0.1mm-0.5mm tolerances. For something like a gun, or other precision mechanism, you really need a design tolerance of 0.01mm to 0.05mm. This kind of tolerance is beyond the capability of most cheap machines and beyond the kinds of tolerances that can be shared in files with other people and have any kind of relevance. The reason this matters is because the printed parts need to interface with external toleranced parts like the steel barrel. It is very possible to print these parts, but the technique requires skill. One could start scaling a part to try and solve this issue. However, in almost all cases, the X Y and Z axis will have different tolerance ranges that need to be accounted for in the design.

The actual functional way to do this requires designing your own parts. Most people that are sharing stuff like gun prints are really just showing off their chops. A fool might try and just print the stuff, but fools rarely get very far on their own. I might take such a file as a baseline to further play around with in design, but I am far more likely to place the part in FreeCAD and use it as a visual reference only while I rebuild the item from scratch. I can easily dial in 0.01mm tolerances, but I do so in reverse. I print many unit tests and adjust my design measurements until the test prints match my real world measurements. I've spent thousands of hours in CAD learning to design well. I can easily design something like a functioning gun. I do not support others doing so or showing off such content because I think it is irresponsible. This is why the general community consensus, and I banned (real) gun related content from [email protected]. I love functional printing and design at these levels, but the subject of guns is not conducive for a healthy general 3d printing community. Not to mention, it is the kind of thing some foolish kid might try without a full understanding of design, and accuracy versus precision.

Systems like a CNC mill use absolute position motion systems. With these, there is no assumed relative position; if the motion command fails to produce the specified movement there is direct feedback and error handling. Closed loop linear motion systems are far more expensive and/or difficult to realize. These are the basis of any real concern. The ability to print something truly robust enough to function like a gun is a matter of quite skilled learning and practice in the real world.

Make your own! https://hackaday.com/2016/07/07/the-best-gingery-lathe-video-series-to-date/

Under $100? You won't find one that doesn't need a ton of work. If you go up to the $1000 range, you'll probably start finding small, old ones that are in useable condition, without tooling.

You can buy all those parts online without registration.

True, but I think this is more about the wider world outside of America.

Can you buy all those parts online in Europe? Or in Japan? I'm in the USA, so I don't actually know, but I would assume they would have tighter controls on that sort of thing.

I understand that the piece in question is promoting the false narrative that this is tied to 3D printing, rather 3D printing has just made it more accessible. As others here have pointed out, the physics behind gunsmithing has been widely known for hundreds of years.

The takeaway I had was more about societal issues that lead to people feeling the need for a gun to begin with, just a different perspective on the same issue.

eBay does not allow the selling of ammunition components, but you can buy some gun parts. I can't say for certain, but I strongly suspect that powder, brass, primers, and projectiles are all tightly regulated in countries that have strict firearm regulations.

Reloading isn't particularly tedious unless you're using a single-stage press. A progressive press moves things along pretty well; once I have my brass prepped (cleaned, sized, trimmed, crimps removed, etc.), I can usually load 100 rounds in 15 minutes or so. Pistol ammo is faster, since I don't have to spend as much time worrying about trimming or removing primer crimps; it's just clean and go (decapping/sizing is the first station in the progressive press). Does it save money? Absolutely. I'll save about $.01-.02/bullet on 9mm, and about $.1/bullet on 5.56x45mm. BUT I've spent well over $1000 on reloading equipment (!!!), which means that I'd need to reload 10k 5.56x45mm bullets to break even.

I understand.

Though the only piece of news that reached me recently about magdumping police cruisers, it was a cop magdumping his own car.