This was a project my 7-year-old and I came up with. We built the clock together (she helped place the components and learned about soldering), and we designed the face to fit the theme of the clock. Because the numbers on the clock face can be set to change colors, a rainbow was the perfect choice for the face. We printed in white PLA, primed, painted, and sealed. It was a great week-long activity, building something together in the evenings!