Did you know you can 3D print STL files without owning a 3D printer? Every Instructable that has an STL file also comes with a "Print with 3D Hubs" button that will connect you with a local maker that can print it for you. Check it out and print yourself one of these handy reading rings!
This project is part music lesson and part science lesson. Making a rubber band harmonica is a great introduction to vibrations, sound, and the effect on sound of string (jn this case rubber band) length. Make some music with the kiddos this weekend!