Ballista

You know when you're relaxing, having a beer in a bar in Esgaroth, and suddenly you hear shouting "Smaug is coming!", and you think "I wish I had a good ballista nearby..." With this, your problems are solved! Perfect for defending walls, towers... Take down dragons at your discretion!!!
Small individual ballista, multi-component (well, three pieces, it's not much...), it doesn't need glue (although it wouldn't hurt either). The ballista is attached to the support by passing a printer filament through the holes (and a little glue is good here, although I repeat, it is not essential)