Simple fruit fly trap.

thingiverse

I know there are much better traps out there with threaded tops, but this was one of my first prints, so I thought I'd share it. This basic fruit fly trap works with most wide mouth canning jars in conjunction with the canning band. After using my own trap, a few things became apparent: 1. There's too much surface area around the opening to the trap. Flies are perfectly happy just hanging out on top. 2. I think they're happy to hang out on top because I printed mine with a low fill factor, leaving it quite permeable to the aromas of fermentation happening below. I've uploaded a new polygonal design that eliminates most of that surface area up top. I went with a polygon because it's a faster print for my machine and at the moment my machine doesn't like circles so much due to backlash issues I have yet to solve. I do have a round version if you'd prefer that.