The article presents the results of numerical calculations examining the influence of channel roughness in a hydrodynamic clutch on the transmitted torque. Additionally, the study reports measurements of surface roughness and dimensional deviations of hydrodynamic clutch rotors. The rotors were manufactured using 3D printing based on material extrusion (MEX) technology and produced from three different materials: PLA, ABS, and PET-G. Based on the analysis of the obtained measurement and calculation results, the suitability of the MEX technology for manufacturing hydrodynamic clutch rotor prototypes is assessed. The results indicate that the surface roughness of the printed rotors is comparable to that of rotors produced by casting or machining. Moreover, the dimensional accuracy of the printed rotors lies within the tolerance range specified in the design of hydrodynamic clutch rotors. The article concludes with findings indicating that the adopted modeling and manufacturing procedure, employing the MEX technology, can be applied to produce hydrodynamic clutch rotor prototypes.