I cut about 1.5" strips of lightweight fusible interfacing, over lap both sides and cut them so that the sides will butt up against each other perfectly, then fuse with interfacing on both sides. No need to zig zag.

I glue baste, and if I know I'm going to be densely quilting the quilt, I won't even bother attaching the batting scraps together! I just glue them down to the backing a strip at a time, making sure edges meet neatly and trimming anything that overlaps. You can't tell at all in the finished quilt. I wouldn't do it for a quilt I'm doing minimal quilting on, but on something that's going to get an all-over FMQ design that's pretty dense it totally works.

I've used the tape with pretty good success.

I piece batting all the time by using the zig zag stitch. I even piece much smaller pieces together to use in pot holders or micro wave bowls. No batting goes to waste.

I do it all the time!! I bought a roll of the iron on tape but I haven't used it - it's easier to me to set the zip zag stitch length as wide as it goes and stitch them together. It the pieces have uneven edges, you can overlap them slightly and cut with a rotary cutter and they will then fit together perfectly. Quick and easy!!

I use leftover batting for placemats and small projects.

I love the tape that you iron on...I get it at Hobby Lobby or Joann's. It works like a charm!

Sure. Just butt the ends together and zigzag - I use the zigzag stitch that is really 3 stitches for each zig and zag, rather than the one that is just back and forth. But any of the methods mentioned here will work. I have just whipstitched the edges together, but it's quite tedious.

I can't wait to try this. I know I have at least enough large pieces to make 2 twin size quilts. Unfortunately I have been throwing away smaller pieces (shame on me!) Thanks all!

I use my 3 step zig zag stitch and butt the edges of the batting together and stitch them. I don't overlap them. My pieces all lay flat and you can not see a thing in the quilt.