Hornet Trap - designed to fit on top of a 340g Jar. Comes in two parts - the main lid and a cap to go over the funnel hole to stop rain getting in. The two can be glued together. The lid has two hoops on each side - for holding the lid to the jar with elastic band**; and to hang the whole thing from a tree.
**The lid does have a screw thread - but I don't trust it to hold, given the variable tolerances of 3D-printing.
Note: This design is experimental. Time will tell if it works. I've yet to try this design in anger - I've printed several and will try it out this year (2017).
Adding the Roof
Having printed both parts, the roof must be glued to the top of the lid, over the hole (see photo).