Very important that all the hex's are the same size. I print mine out on harder cardboard so they don't change size, and I use a program online to make them. http://incompetech.com/graphpaper/hexagonal/ you can choose size and thickness of lines to print out properly. Also http://www.jaybirdquilts.com/2010/08/hand-sewing-hexagons-part-1.html has a great hexi tutorial. Try this.