Circle Drawing Tool - 3D Printed

I needed a precise circle drawing tool. I acquired the 1/2 inch aluminum bar from the hardware store, the self-adhesive metal measuring tape from Amazon and 3D printed the attachments. The marking holder can be moved from a minimum of 1 inch out to a maximum length of 15 1/4 inch. The marker holder is designed to hold the Clover Chalk marker, but can be used with any other marking device.