Cleaning unit for gentle cleaning of 3D printed objects. The IMPRIMO® Clean creates a circular flow in the cleaning solution to minimize the risk of micro-cracks in the part surface, thus increasing its quality. Different cleaning programs allow for precise matching with the selected material class and choice of the cleaning agent. The easy removable insert enables quick and clean replacement of the cleaning solution. The cleaning unit will be able to communicate with an app via a wireless network, to allow for complete documentation of the cleaning process.