Print a funnel to catch fruit flies!1) Print the model with zero top and bottom layers, 2 or 3 shells (perimeters) and zero fill. 2) Put a piece of fruit in a glass. 3) Put the funnel in the glass. 4) The fruit flies check in, but they don't check out!I hear this may work on bees as well, but you'd need to cut some off the narrow bit.