Project Ideas! — spirograph

Remember Spirograph? The fun, oddly satisfying, geometric drawing set you or a friend may have had growing up. I didn't have one as a kid, but I always wanted one. I thought summer would be a great opportunity to tap into my inner kid and make a set. When you figure out the vectors, you can have us cut this in a single 6"x 12" unit in clear acrylic for $30 or try a cool neon transparent acrylic like the transparent neon green that I used for this project.     I'm not including a downloadable .PDF, because we don't like...