Glenda,
Wifie says: "We are jealous". Wow, NONE of my attempts have come out anywhere near that nice.
I have two of those Singer ZZ attachments that use the cams. I have instructions with both of them. I have tried them on several machines and just can't get them to work worth a hoot. My ZZ stitch always comes out real narrow, and I can't compress the stitch length enough to get any decent patterns.
Both of the attachments are in good shape, clean and lubed.
Did you do anything particular when you set up the attachment?
What machines does your instructions say yours is for?
Mine say they are for the Mdl 15, 201, 221, and maybe the 301.
Joe