Generate QR code of URL of git repo on GitHub using http://goqr.me/#t=url with error correction M, border 0, size 150, foreground white and background black, and download it as PNG.
Add .scad representation of QR code, generated using img2scad
Add birthday greeting to README. xxx
Fix bug: - -> _ in constant name
Increase height of box, since it's rather wide and when scaled down to fit on print bed it gets shorter too.