Google it. Then print one and enlarge it. I did it like that and made a couple different ones you can increase or decrease the size. I do that with and use template or cardboard. If you have the comic board paper they make decent templates. Shirt size gift boxes you can purchase for 3 or more in a pack (usually 6 pcs. lid and bottom) are really good for templates. I write on the templates the sizes and shapes. Some of the shapes can get one confused with the different triangles.