Print on cardstock at 100 ppi. Score all lines before folding. Really really important with this one to score the lines first. When you're folding, work from the outside in. Folding the center lines for the petals first, then the inner lines, then finally the lines on the inner octagon. As you fold each set of lines, the next inner round folds more easily. When it's done the whole thing goes together very easily. Arrange the petals so they overlap in the same direction. To open, hold two petals that are opposite each other and pull gently. After it's folded together right, it closes just as easily.
You can buy a blank 300 ppi digital delivery version of this template at my Etsy shop.
Click on the images for the full sized version.