I've been asked how to make the string blocks that I used in my Zig Zag quilt I showed last week. Photo step by step as follows. Here is the finished block.
Mark a line 1/4" away from "corner to corner" as your guide for your first strip.
Now your base is ready to go. Notice the line is NOT corner to corner, it is offset by the 1/4"
Take your first strip and lay the raw edge even with your DRAWN line. Make sure the strip extends over the block on each end.
Flip your block over and use the base as your guideline for trimming.
Using your ruler, trim the overhanging strings right to the edge of your base.