I'm too impatient to mark all of the hexagons, and sew them together using my machine and a 1/4" foot in addition to a 1/4" mark going crosswise in front of the needle. Put two hexagon edges right sides together. Start 1/4" from the beginning of that edge (it's probably 2" or 3" depending on the size of the hexagon), sew a 1/4" seam and stop 1/4" from the end. That's why you need the crosswise mark on your machine plate. Open up the two hexagons that you have sewn together and press. They'll be joined along a short edge. Take a point of a third hexagon and you will see how it fits between the edges of the two you have already sewn. Now you have two edges to sew together with a "Y" seam. As long as you start and stop 1/4" from the end of each seam you'll be just fine. Press again. Pretty soon you'll have a bunch sewn together!