Spyder Arctic Laser is the world's most powerful laser you can legally own. It's got a cool-blue, but blazing-hot, laser beam. This company also makes a flashlight so bright, it can cook an egg and set things on fire.
Create drawing robot with 6 plastic printed parts, 2 micro servo motors, a rubber band and a pencil. See the design iterations further down the page. It now has 3 axes with 8 parts and can use WaterColorBot's code.