Thanks for the link. It helps to even calculate the best size of block for minimal waste! Great.
ie. if you plug in 6" squares with a WOF 40" you'll need 17 strips for 100 blocks.
Same if you use 6.5" blocks.
But if you go up to a 7" block, you need 22 strips - a lot more fabric.
I might just change up a pattern to waste less fabric!