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After lots of tweaking I finally got it to just the right shape. I'm not any good at setting things up to print, but if you print this entire page out onto standard 22x28cm paper (make sure to uncheck "fit picture to frame") it SHOULD print out to the right size and resolution. When you stick it in, push it upwards so that the top lines up with the underside of the ridge inside the mask. Then secure it with clear tape or whatever you want to use. Also, feel free to modify/edit the design however you want.