I took a class with Gyleen Fitzgerald last summer. Her method is called "butterfly seams" bc of the way you sew the pieces; as you add the 3rd piece in, the unit looks like a butterfly from the backside.
I did enjoy the class, and FINISHED the quilt - in part because I was afraid I'd forget how to do it, lol. Although her class uses her ruler, bc of the way the pattern is designed, you could use the sewing method for anything with a Y-seam.
You can see a demonstration of it here. Kind of long, but you can start at 5:30 for the sewing, and don't need to watch the whole thing if you don't want to see the 2nd round added.
https://www.youtube.com/watch?v=4DFqprE4T2g