DIY Magnetic Mixer

Work in Progress.... This is for a DIY magnetic mixer from easy to find parts. It has mounting on the bottom for a 12v pwm fan speed controller, about 7 dollars on amazon or ebay, and a toggle switch. Uses a 12v 40mm fan with a permanent magnet from a old laptop harddrive glued to the blade hub. The lid has pegs to align the fan to the center and has posts on the side to use a rubber band to secure the fan.(no screws to vibrate off).