##September 1st 2023 UPDATE: there was an error on the Roof-central-frame.stl part. It's now correct. please upload again that part if you already had. Sorry for the inconvenience.

##NEW assembly guide: https://youtu.be/gQwfLWtcTBI##

Why a new version?

This is a brand new version of the Asian hornet trap I designed back in 2021 (https://www.thingiverse.com/thing:4786899).

• the former model required a bit of wood working. Choosing the right wood, one that could endure harsh weather conditions was not easy (I know because my unit is now almost ruined because of a bad choice). Cutting and assembling boards at the correct dimensions, including the round hole for the bait jar was also a bit challenging for some people.
• you had to find the right model of glass jar to put the bait in, with the correct thread to fit the adapter (it was not very common).
• getting rid of hornets was not trivial if you happened to capture some.

So how is the new version better?

• first, it’s almost full 3D print. You only need some easy-to-find, cheap DIY supplies and a good PETG filament to achieve the project and assemble all the parts without hassle.
• the bait jar is included in the model. Push it in, twist clockwise and it’s locked. Reverse the process and the jar is back in your hand.
• the whole structure can be immersed in a bucket of water to drown the pests without damage to the trap.

And of course it is still safe for bees or other harmless insects: the horizontal grooves on the sides are “queen bee excluder” compliant (4.3mm high).

The holes at the end of the inward funnels have a diameter of 8mm, to let asian hornets in but not out.

Should some unwanted insects get in the trap, they can get out, even if they are attracted to the bait. They cannot drown in the liquid bait, thanks to the mosquito net that is attached to the structure, above the jar.

Removing the jar to refill it is totally safe. It does not let the captured hornets out since the mosquito net is fixed to the structure, not to the jar!

The bait jar has a 20cl capacity (about 6.7oz) so you can put a fair amount of bait inside. Just in case, here is a bait recipe I found on the internet (choose whatever you think is better):

• half a volume of dark beer,
• a quarter volume of blackcurrant or grenadine syrup,
• a quarter volume of white wine (acts as a bee repellent).

You should prepare a whole bottle of this mix and store it somewhere. Whenever the jar is empty, shake the bottle, pull the jar out, pour some liquid bait and attach the jar back to the trap.

The roof is mainly see-through so you can see everywhere inside the trap. The central part of the roof is a hatch you can open if you need to access anything inside. It pivots around one of the structure’s steel rod and softly locks on the opposite rod. Be careful not to inadvertently open it though, while manipulating the trap, if it contains a dangerous species.

Parts list

A detailed assembly guide is available here.

• PETG filament. I chose it red because apparently asian hornets are attracted to that color. Don’t use PLA! It is not meant for long outdoor exposition and harsh weather conditions (PLA drinks humidity and can warp under direct sun exposition). You will need a fair amount of filament. Many large parts, prints are long but easy. Apart from the funnel parts, most parts can be printed in pairs on a 20cmx20cm bed. No supports necessary at all!

• Four 3mmx300mm stainless steel rods. They are used to hold the structure and also as a hinge and lock for the hatch at the top of the trap. These are apparently common parts for RC models so you can easily find some at cheap price on Amazon for instance.

• Twenty-two M3*8mm stainless steel Hex Socket Head Cap screws.

• Twenty-two 5.7mm long with 4.6mm diameter base M3 brass threaded inserts that will be pushed down in specific pre-shaped domed slots on the model parts with a soldering iron (as shown in the video). This type for instance.

• Two 90x75mm and one 90x85mm, 2mm thick PMMA (plexi) panels for the see-through roof and hatch.

• A patch of mosquito net that will be cut around the 90mm diameter gasket.

• A bit of neoprene glue (only to seal the mosquito net and the plexi windows).