Milk Jug Fly Trap

thingiverse

Based off a design by bothmahj, this design fits one gallon and half-gallon size milk jugs perfectly. It prints upside down with no supports needed at all. The thing slips easily into the top of the jug, fitting snugly without any threads to worry about. When you're done using it, simply pull it out, put the original cap back on the jug, and toss the old cap into the garbage. To use it again, just reinstall it onto a new jug - that's how easy it is!