Zhreng3's Seej is a free/open 3D printable tabletop war-game, a real-world tower-defense game you print and play at home. Seej's players come up with all sorts of innovations that are integrated into a constantly updated set of free designs.
The proliferation of inexpensive filament printers with smaller build platforms requires the advent of a smaller Seej engine, so I’ve added the Marshmallow Mangonel to the kit.
The classic catapult gets improvements inspired by community feedback, too. It’s all compatible with older prints, and is much, much more accurate.
Seej is an Open Source tabletop wargame designed to advance the state of 3d printing through competition and player-directed evolution. Rules for Seej are at www.s33j.net.
I write books. My latest is a YA science fiction novel called Homeland (it's the sequel to Little Brother). More books: Rapture of the Nerds (a novel, with Charlie Stross); With a Little Help (short stories); and The Great Big Beautiful Tomorrow (novella and nonfic). I speak all over the place and I tweet and tumble, too.