3D printing was used for maximum versatility in design and manufacturing, as well as to allow userspecific modifications. User requests and stirring readouts are handled via ARDUINO Pro Mini 3.3V 8MHz microcontroller . A standard motor is used for rotating a plate with magnets (magnet dimensions 25×8×1 mm, see Supplamentary Information (SI)). Control over precise rotation rate of the plate is done via a magnetic sensor. The device's profile is approximately 4 mm higher than the standard default sample holder (catalogue number 700005209), and consequently UPLC needle height was adjusted. An overview of the device is given in Fig. .