Welcome! You have found the secret link to QRCode city!
I did this on my own time with some help from my wife and daughter (I can't paint). It is 100% a learning experiment with QRCodes, 3D models, and to see if anyone would actually get to this blog post from the QRCode. Maybe it will go viral on Pinterest!
OK, probably not. I'll be happy if someone just finds this post.
Speaking of 3D printing, the model above was created with the Stratasys uPrint SEplus. This is a nice little FDM workhorse of a 3D printer that is also popular at universities. If you are a student, talk to your school. The models paint well too :-)