fruit fly trap with a 12v pc fan blowing fruit flies into the container when they try to land on the lure that is in the holder. You can hear the fruit flies get crushed by the fan blades ... nice to see beyond irritating fruit flies get sucked into the container. It works without the lure holder because I have apple cider vinegar + a few drops of detergent and cooking oil that fruit flies are attracted touse M4 x 30 bolt with nut and securing pc_fan_duct + PC fan + pc_fan_exhaust. Or use a binding wire to thread through the holes and twist binding wire to everything is tight together. There are 4 holes in pc_fan_exhaust where I threaded a wire through so that they cross each other so that the computer fan is not flush with the container and the air that the fan pushes into the container is not being pushed up through pc_fan_duct but blows to the sides of the container As bait, I use apple cider vinegar, a few drops of detergent and a little cooking oil. Fill a bit of bait in the bottom of the container. optionally in bait holder PC fan dim: see image added