DIY CD + Water Bottle Bubble Machine
You can pick up a bubble-blowing machine for about $20. But if you prefer to DIY all the things, CrazyScience has got you covered. In this video, they show how they built a simple bubble machine by drilling holes in a compact disc, attaching it to a motor and battery, adding a small fan, and using a water bottle as a reservoir. Read the full build guide on Instructables.