I purchased light weight interfacing, cut 2-3 inch strips & ironed that on the joins. Much like the tape but the interfacing was on sale for about $1.00/yard & worked as well IMO as the tape & much less pricy.

I use Heat Press, some folks say it's pricey but I buy it whenever I see it on sale. Works really well.

I use batting tape, but if you have a lot of relatively narrow strips that might make the quilt stiff. I know people who have done the zig zag stitch on their sewing machine and been happy with that. Whatever you do will work out fine.

I also use the wide iron on tape made specifically for the purpose of joining batting together and love it. You just have to read the iron setting recommended by the tape manufacturer...if you set it too hot, it could stick.

I by mistake, bought the good old sewing interfacing,iron on. So, when I need to join batting pieces, I just cut s few strips of interfacing and press my pieces together. Works great, and is lots cheaper than the already cut product.

I have zig zagged and used the tape. I prefer to zig zag as it goes faster.

I zig zag mine. I use all shapes of left over batting & just sew them together. Works great for me.

Maryb119, what is the 3 step zig zag stitch.

I do nether. I use cut strips of lightweight fusible interfacing, trim the edges so they will butt up perfectly and then fuse. I have always been able to feel any zig zag stitching on the batting when the quilt has been finished. Just my preference.