This object has been drawn and printed by students aged 14-15 of the (Name) Secondary School. The activity has been carried out within the Erasmus+ project PRINT STEM www.printstemproject.eu and co-funded by the Italian National Agency INDIRE. Bernoulli's equation connects speed, pressure and height in a non-rotational stream of liquid. The Venturi Tube is a famous application of Bernoulli's equation. It shows how the pressure changes in function of the speed of the fluid.