High-and ultra-performance liquid chromatography (HPLC and UPLC, respectively) are common analytical tools for the detection and identification of components in complex mixtures . At the heart of these techniques is sampling and then separation of the sample by the use of a column with appropriate properties, leading to different compounds eluting at different times from the column. Stirring a sample is fundamental in many experimental setups as it promotes mixture homogeneity. Furthermore, in systems where large assemblies are formed, mechanical agitation can lead to their breakage and is an important part of the system's behavior . Stirring can be done by placing a (Teflon coated) magnetic bar within a sample and placing the sample over a device with a rotating magnetic field. Here, we have developed a UPLC stirring device that replaces a standard sample holder and enables battery-powered magnetic stirring in a similar manner to standard laboratory stirring devices. Any experimental setup that requires continuous stirring can now be run inside the UPLC machine, allowing for multiple measurements at various times without the need for sample preparation or human intervention. We demonstrate the applicability of the device with the usage of a system that has previously been shown uniquely respond to stirring -exhibiting exponential growth that is enables through a fiber elongation/breakage mechanism . The development of this device employed open-source content and 3D printing, aligned with the increased do-it-yourself movement in sciences .