Here's yet another You-Tube demo of machine-sewing hexagons, and easier even than the first two.
https://www.youtube.com/watch?v=ihEac0jRvsU
Instead of having to start and end exactly 1/4" in from the fabric edge you just sew the seam normally, then take out a couple stitches after the second seam locks the first one down. This has me wanting to try some hexies!