My first 3D printing project was a 1:12 scale dollhouse sized foosball table, fully functional with ball return and moveable parts.

The mockup, before printing, looked like this:

You'll notice each leg of the table has a small indentation running it's length: this is to minimize printing costs, as every bit of material adds up quickly.

The plastic foosball table, fully printed and hand-painted. A small ball sits near the penny.