This is a small venturi vacuum pump I designed in on shape. It is probably the smallest vacuum pump possible and can be printed to weigh under 10g. If water is added to the side hole (Vacuum inlet) and an 8mm pvc tubing connected to the bottom hole (Compressed air inlet) the venturi effect will decrease the pressure and suck the water in, mixing it with air and functioning like a carburetor. You can use this to atomize liquids to freeze them or burn them efficiently, thus the “Ice cream machine” tag. This model should print easily on any printer.