I suggest the Hexi n more by jaybird it has multiple uses. check it out
http://www.jaybirdquilts.com/p/hex-n-more.html
and here is a video
http://youtu.be/FRpCnrNUdJw
She also has another ruler called the side kick
http://www.jaybirdquilts.com/2013/07...-sidekick.html
I have both rulers and love them both