Ok the largest HST I usually use is 1 1/2" so I don't pay any attention to bias or grain. But I am going to try a larger block and see.
So someone tell me what problems do you run into with bias. If I understand it right it makes the fabric stretch right?
I'll try a 4" square and see what happens. I learn by trial and error and if this is affecting the HSTs then I need to be aware of this for those who do make quilts. When I use the small HSTs I have never had any problem. So I am assuming that the larger blocks will need some thought.