On Demand

More on guns, CAD/CAM, and 3-D printers. (Dear Internet: can we please just start calling these things replicators? It's much less clunky, and so much more descriptive of what they actually do).

CAD/CAM files (the computer files that 3D printers transform into physical objects one layer at a time) for the .45 caliber M1911 or the 1911A-1 single-action, semi-automatic pistol have been online for years. In fact, you can find all kinds of CAD/CAMs for all kinds of gun parts, bomb parts, bazooka parts, rocket launcher parts and other deadly weapons online. These are computer files, like songs or movies or documents or images, they cannot be protected or digitally rights managed (DRM) any better than the entertainment industry has done with its intellectual property. A file is a file is a file, if someone wants to copy it – it will be copied. You can’t tell what the file contains unless you open it and, most importantly, there is no way to ban or prohibit the transfer of files. In this case, the genie is out of the bottle, you can’t put the toothpaste back in the tube, the ship has sailed – the files are out there.

Plastic guns? Seriously. How about guns printed in steel, guns printed in carbon fiber, guns printed in, you name it – there’s a 3D printer that can print in the medium. In a world of 3D printers, there is no such thing as gun control – people who are so inclined will print all the guns and ammo they need – untraceable, no serial numbers, no markings about point of origin, no trade marks, nothing!

That’s the dark side of this technology. However, the benefits of 3D printing are overwhelmingly positive.

This is a picture of a 3D printed replacement part for a baby stroller. It was printed at a 3D printing bureau called Shapeways. You can think of Shapeways as a Kinkos for 3D printing. Shapeways prints in all kinds of materials, including stainless steel.

One of the employees of Shapeways needed a replacement part for his kid’s stroller, so he emailed the manufacturer and they emailed him a CAD/CAM file for the part. He printed two of them in stainless steel...

This stainless steel part was annealed, deburred in a tub of ceramic balls and looks exactly like the spare part the manufacturer would have sent him. The difference is profound. The replacement part was printed on demand. The spare part would have to have been manufactured in advance, stored on a shelf, picked, packed and shipped. Rent would have been paid on the real estate the physical spare part occupied and it would have to be kept in stock during the entire useful life of the particular stroller design.

In the twentieth century, several technologies profoundly changed human existence. Electrical transmission, the internal combustion engine, the aircraft, the electronic computer. Obviously I have no way of knowing what that list will look like for the twenty-first century, but I can tell you one that will definitely be on it: replicators. Get used to it.