Doomsday clock

thingiverse

A Family-Friendly Countdown Clock - Ready for Some Real-Time Action! You can now easily keep tabs on time as it ticks away until Doomsday with this exciting live-action countdown clock. The fun never stops, and everyone gets in on the action. Print out a single face with four hours marked, along with working hands to complete the experience. Add an extra touch of realism with a 1-inch long M3 screw that passes through both the hands and the face, giving you an authentic time-telling experience.