Some Bosel fusible interfacing with 2" grid printed on it to use us some of my scraps; amazing how the seams match up. I will definitely use it again to use up all those little pieces of fabric in my stash for a postage stamp quilt. Saw a video on Shabby Fabrics demonstrating on how to use, and even a post by by Elizabeth Hartman has instructions on how to make your own fusible grid interfacing for quilting. If she uses it, then it works for me. She also stated on her post that the quilt/interfacing will soften up and separate after some washings and the quilts will become so soft you won't notice.
There are so many videos out there on how to use this but here are the two I referenced.
https://elizabethhartman.com/all-pro...le+interfacing
https://www.youtube.com/watch?v=DtLugTXU0BY