Grand Prix: "Infinite Print Loop"
A 3D printed spiral staircase that somehow printed itself while printing itself. We don't know how, we just do.
Runner-up: "Glow-in-the-Dark Gnome Farming System"
A system for growing glow-in-the-dark gnomes in a controlled environment using 3D printed tubes and plastic filament.
Special Mention: "Printed Plastic Puns 3000"
A 3D printed pun generator that prints an endless stream of terrible, yet somehow endearing, puns using only plastic filament.