As far as I know, I was the first person to publish a generalizable method for creating a QR code stencil or to even clearly document why such a method was difficult.
However, since that time, I have realized that other approaches would ultimately be superior. The two I have been pursuing are automated embroidery of qr codes and improved stencils using laser cutting or 3d printing.
I will likely be abandoning the latter work, now that my early attempts have been eclipsed by Golan Levin at the Studio for Creative Inquiry at Carnegie Mellon. This work is being released from fffff.at, whose motto is: release early, often and with rap music.
Here is a link to his post on his new laser-cutter QR code stencil generation code. Along with his first application, a remake of hobo-coding.
Golan gave me a shout-out on the post he made. In some ways, it is hardly justified, since his method obviously surpasses my chicken-wire method in several ways. In fact, the only outstanding benefit to my method now is that it is much cheaper, and you do not need access to a laser cutter. The codes generated from his method are cleaner, and could probably be made smaller than my methods, and do not require an hour of working with caulk.
In a private email, he mentioned the possibility of a githib release soon…
In any case, take a look at the wonderful photos of the stencil in action.