Your QR-Code can easily be printed with most printing methods. Make sure that the contrast from the background to your QR-Code is as high as possible so that the code is easy to recognized. Should this not be the case there may be problems during the scan. You can also color the generated QR code by using a graphics program, but make sure that the code color stands out from the background color.
At the size of a QR code there are no limits as long as the reader can analyze the whole picture. But consider that you can badly scan a whole poster with a smartphone if you stand directly in the front of it.
If you have decided how and where you want to print and spread your code, note the focus of the print. Especially in textiles you should possibly customize a test print and test this with your smartphone. QR codes can be printed for example on:
- Roll up banners
- Newspaper ads
- Business cards
- Sugar cubes
- Permanent or temporary tattoos