Yes, you want to square up each unit that makes up the big block. It can be tedious but will give you the best results for a proper size block.
I just made a HST unit with a 4 inch square. Before squaring up, it was a little over 3 1/2 inches. Are you familiar with “squaring up” technique? Let us know if you need help. You want to “square” from the center seam out to the size needed.
Next question, did you perhaps pull from the 4 inch squares instead of the 4.5 inch squares? Easy to do.
I recently made some QST that didn’t come out correct. I upped the starting size and then trimmed down to size needed.
Last edited by Rhonda K; 09-25-2022 at 11:35 AM.