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This little keyring is based on my larger Articulated Shenron model. It has some articulation, but the legs do not move, and the neck doesn't move either due to the addition of whiskers.
I would not print it any smaller than the provided file. I also would not use it on items that go in a pocket or a bag. It's best used on the outside of a bag.
If you'd rather not have it as a keyring, simply delete the negative cylinder part as shown in the picture, and you're good to go!
I printed mine without a brim; providing your hotbed is clean/freshly glued, you shouldn't need a brim either. Supports are not needed for 99% of this model; do not use them or the model can break when you remove it from the supports!
HOWEVER; I have painted supports on the whiskers, as they float from the hotbed and would fail to print without them. Do not change the support settings, or you'll lose the manual painting I did. If for some reason the supports aren't there, you can paint them yourself; just make sure it looks similar to the below image and you should be good.