Chicken leg Identification Bands

I have a small chicken coop with 6 egg laying chickens in it and need to keep track of which one is which. I designed these bands to be quickly clipped on and be removed, if necessary, without the use of any tools. They are numbered 1-6 using roman numerals but you could just as easily print them using different colors. They can be used with other animals and can be scaled as necessary. The demo in the first pic was printed at .2mm as a proof of concept but you can print at any quality you choose. Really tho, they're chickens. They don't care about quality and at .2mm, it takes about 7 minutes to print one allowing you to knock off hundreds of them in a day if necessary.