I had a teacher show me how to do circles and the cost is under a $. You use a thumb tack with a piece of tape on it so that you can tape it (pointed side up) to your machine then put your material on it and you a pencil eraser (I used one from the mechanical pencil) on the tack to hold the material down. Where ever you put the tack at will be the center of the circle and it almost walks itself around as you sew. I keep it taped to the side of my machine. Janome wanted $36 for the attachment that did the same thing. This will work with all machines. Sorry, I didn't see the above until after I posted this. It really does work