Fruit Fly Trap

Print this thing and put it on a lemonade glass filled with some apple vinegar.
The tiny flies will enter the hole and won't be able to escape.
The lines are for the scent to reach further, it is small enough to prevent the flies from escape.

Suitable for glasses with a opening up to 9 cm!

Update! V2.0 per August 19th 2018
Better printability, no supports needed.