Comminution of plastic or visco-elastic materials is known to be energy-intensive and costly. Typically impact mills, cutting mills and jet mills are applied for comminution and the feed material frequently is pre-cooled using liquid nitrogen or solid carbon dioxide. Therefore, especially the production of fine polymer particles by the aforementioned dry grinding methods is challenging. We demonstrate that wet grinding of polymers [1] is a feasible approach for production of fine polymer particles that e.g. may be used as a starting material in a process chain for production of spherical polymer particles that can be used in in additive manufacturing [2]. Wet comminution of polymers will be discussed amongst others for polybutylene terephthalate (PBT), polycarbonate (PC). Moreover the possibility to produce mechanically alloyed PBT-PC blends will be addressed. The products are thoroughly characterized by means of vibrational spectroscopy (IR, Raman), X-ray diffraction and dynamic scanning calorimetry. The dependency of the grinding result on fundamental process parameters, such as e.g. stirrer tip speed or grinding media size as well as on the process time, process temperature and the system composition will be discussed. In any case high load conditions, i.e. high stress energies are needed to initiate breakage of polymer materials. Optimization of the process with respect to process time and energy consumption by appropriate selection of process temperature and solvent will be demonstrated. Especially the selection of appropriate solvents allows for remarkable reduction of mass-specific comminution energy needed. [1] J. Schmidt, M. Sachs, C. Blümel, B. Winzer, F. Toni, K.-E. Wirth, W. Peukert, Powder Technol 261 (2014) 78-86. [2] J. Schmidt, M. Plata, S. Tröger, W. Peukert, Powder Technol 228 (2012) 84-90.