Here's a decent pic...there are many out there if you google...
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I do it a lot. Yesterday I saw a new tape for this purpose on Creative Grids website.

I also piece my batting when needed. Batting is getting to be so expensive that you have to cut corners where you can.

Don't mean to be dumb, but do you zigzag with needle and thread - long or short zigzags?

I piece batting and don't blink an eye. Not only are we saving $$ resources, but what would happen to all those odd pieces of batting if we didn't piece and use it?

I zigzg on my machine. Never an issue.

i do it all the time. i save strips and chunks of batting and zig zag them together for charity quilts.

Thanks Toolazy. I am going to experiment on some very small pieces to see if I get better results. Never thought about the tension since it looked good while I was doing it. Duh

I to piece batting togather-don't see anything wrong with it no one knows unless you tell them and if they don't like it then they can do their own quilts, that's the way I think!

I also piece my batting. I use the widest zigzag stitch my machine makes. Once the quilt is finished you can't find the pieced section.