We needed a prototype of an electric motor to see if it fits into our customer's electric vehicle. We could easily prepare the model in our workshop, using Ultimaker 3D printer. The printing took 20 hours. The prototype was made of PLA plastic. It was printed in two parts, because of the complex structure of the item.
Ultimaker 3D printer suits very fine for preparing prototypes. Using prototypes saves money, because you can make all the needed improvements into the protoype.