USB Magnetic Stirrer

thingiverse

A Magnetic Stirrer Makes Mixing Simple: Build One for Under 5€ A magnetic stirrer is an indispensable tool for any liquid solution mixing task. Building one using this method requires minimal parts that can be easily sourced from reclaimed materials. With new parts, the total cost will be less than 5€. Bill of Materials: 1. Enclosure (printed or DIY) 2. Power Switch 6mm 3P 3. USB-A inlet 4. 60mm Fan (12v) 5. 5mm LED (optional) 6. 180 ohms Resistor (optional) 7. Neodymium Magnets: - 2x for the Rotor, - 3x for the Stir Bar (flea), or - 1x Rotor + 1x 20-30mm Stir Bar Build Instructions: [Visit this link](https://youtu.be/6bDGU4-4F88) to watch a video tutorial on how to build your magnetic stirrer. Print Settings: Printer: Prusa i3, CoreXY, Tarantula Rafts: No Supports: No Resolution: 0.2mm layers Infill: 85% (solid infill) Post-Printing Instructions: To prevent corrosion, carefully package the stir bar in packing tape. Design Philosophy: The simpler, the better. Most DIY magnetic stirrers use a 12v fan powered by a 12v PSU. However, they often require a potentiometer to step down the voltage. This method allows you to vary the voltage, but typically, a 3-6v fan is sufficient for gentle or fast stirring, respectively. Consider powering your stirrer with +5v USB power instead. It's a great idea, except for fine chemicals, it meets about 80% of makers' needs and you probably have USB ports available everywhere. All you really need is a power switch and a fan.