Rubber Band Catapult

A simple catapult model, working on 1 or 2 rubber bands.
Should keep kids around 5 busy for a moment, throwing things all over the place.
Ammunition can be printed out of TPU (reducing the risk of broken glass), but dried peas should be OK as well.
Should be mostly harmless, annoying at the worst, and a good manual exercise for the kid (pretty hard to get it to fire in the right direction if you ask me)...