Mason Jar Fruit Fly Trap

thingiverse

This fruit fly trap is designed to work with a standard pint mason jar. Just put some apple cider vinegar and a drop of dish soap in the jar, then drop this in the top and screw down the ring gently, and fruit flies will be all over it. The jar this fits has a neck with an outer diameter of about 66mm and an inner diameter of about 59mm, so just scale this up or down in your slicer if you've got a different size of jar.