In diploma thesis we wanted to determine whether 3D printed prototypes are a suitable alternative to those made with a prototype tool in measurement field for the purpose of their use in companies due to the problem of high prices of prototype tools for plastic injection of different masses. According to the existing metal concept we constructed a new prototype followed by printing on a 3D printer where we recreated three different roughnesses of prototypes. In the measuring laboratory we measured the roughness of the inner surface of the blower fan for all prototypes and then we analysed the air flow in the measuring chamber. Additionally, we have also observed the operation of the fan motor where we focused on its power consumption and the speed of the motor. The obtained results were plotted and analyse has shown that the air flow is the largest, as is the maximum power consumption of the engine and the number of turns minimum in the smoothest inner surface. Vice versa the air flow is the smallest, as is the minimum power consumption of the engine and the number of turns maximum in the course inner surface of the fan blower.