A few years back, when I was originally creating the Pinwheel Pattern. I needed an easy way to fit more triangles into a smaller space... and the 'Prism' Fold was born!
This fold will give you an easy way to create more narrow triangles, than the more traditional Basic Triangle Fold does... but, what's even better, is that you can adjust the width of your Prism triangles, depending on the pattern you're using.
This short video will show you what I mean. 🙂