This is a backlighting box for the Custom QR Code generator.

It uses 9 x 3mm white LEDs.

Used it at SoliDoodle's 3D Printing Expo after-party. While it worked great in my lab, using my Android phone, with the AT&T supplied code scanner, I found out at the party that Apple's Code Scanner didn't read it. However, when I saw people scanning the code - unsuccessfully - I would just approach them and introduce myself and my product line... Better than a website link, many people remarked...

run the QR code customizer with the following options:

QR Code Data Display Method = 1
QR Code Mirroring = NO
Select Main Object = 4
Thickness option = 1.8
round_corner = 1
rounded corner_num = 0
Width of object = 80
Height of object = 80
Thickness of object = 5
Distance from tag edge. = 0
Wall thickness of perimeter = 8
Wall height of perimeter = 02
Scale multiplier for code = 2.5
QR tolerance = 0.001
X location of QR code center = 0
Y location of QR code center = 0
Z location of bottom of QR code geometry = 1
Thickness of QR code = 2;
Rotate QR code around z-axis = 0
Input from data generator for dimension of QR code (copy and paste from QR SIZE.txt) = 33

When printing the QR CODE, once all the flat base layers have been printed in white and the actual code layers start getting printed, switch up your filament to black. This will provide the contrasting color needed for the QR Code to work. THIS IS CRITICAL !

Print all the other parts. (all black except the INNER LED BOX - which should be white)
clean up the holes for the 3mm LEDs
The back of the inner LED BOX prints on the bottom. the front of the box (the "sleeve") faces up during printing. The LEDS poke through the back towards the front...

power up those fine LEDs. I used a 9 VDC power supply, wiring up 3 parallel rows, and then putting those 3 rows in series, with a 100 ohm resistor on the + side of the incoming power line.

-- NOTE -- you should check out one of the many LED schematic calculators available on-line to make sure you're LEDs will function properly, without burning them out.

insert the QR code into the outer box, code facing the rim of the outer boxhole in the
insert the inner LED BOX sleeve first, and slide it all the way forward.
run the power supply line through the hole in the rear cover.

you can glue it all together, but it's a tight fit, so it probably won't be needed.

once complete, this box can be attached to anything - making a cool and VERY OBVIOUS QR Code for people to scan.

I will be updating this soon, as I do want to make this work properly.
Anyone who does build one of these, please report back with your QR Generator Settings, if you get the resulting QR Code to work reliably...