The card stands on its own, but folds flat for mailing. Instructions can be found here. I changed the measurements to make mine an A2 card, so I started with a card base of 5-1/2"x8-1/2", scored at 2-1/8", 4-1/4", and 6-3/8". I kept the marks for the diagonals at the same depth given in the video.
Date: Saturday, March 16, 2019 GMT Views: 1099
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