Magnetic Stirrer

thingiverse

Update 04/08/2020: I finally got around to installing a PWM for speed control, and I'm thrilled with the results. So far, I've been using it for mixing Calcium and Alkalinity solutions in my marine aquarium as well as starting yeast cultures for home brewing. A heated plate would likely be better, but I haven't had any issues just using water at 30 C and letting the stirrer handle the rest. Assembly video: https://youtu.be/ugCic-LoJRo Magnetic Stirrer v1 Works By Using a 12V 120mm / 25mm PC Fan to Which I Glued the Magnet Disk and Inserted Two Magnets. The Magnets Are 8mm Wide and 10mm Tall. At the moment, I'm running it off a lab power supply at 5V because the fan spins too fast at 12V and my stir bar can't keep up with it. I've included three different sized disks in my design since the distance between the two magnets used depends on the stir bar size. I'm using disk 3 with the magnets inserted in the two closest holes, and it works with stir bars between 25 and 35 mm. You'll also need four M4 * 40mm long bolts and corresponding nuts to hold everything together.