Drew this ages ago. Sadly moving house, changing jobs and DIY has got in the way of printing toys. It is first on the list when I fire the TOM up again - once I've understood the 5D firmware...

This will use lots of plastic and then more as you ping stuff around the room.

Everyone needs a siege engine or two. This could be the start...

Spend ages printing (perhaps go watch a film or 2).

Assemble with bolts.

Add elastic bands.

Ping!