Very nice I made one but it came out wave and my zig zag sew and then I see straight stitch

I just went and got the gadget for it to do. The jelly rolls rugs myself and clover there. I've been looking it up on everywhere. In even your videos you didn't say how wide the strips are. That's why I'm wondering cause I wanna make my own strips myself. The ones I have here in them in my craft room.

Do you put string or something in the strips to make it so nice and puffy?