Mystery Clock

This clock is inspired by the “Mystery Clocks” produced by Louis Cartier in the early 1900s. The hands appear to move by themselves without any visible driving mechanism. In the Cartier clocks, the hands were embedded in discs of crystal that were driven at their edges by hidden gears. This humble 3D-printed version utilizes acrylic discs instead. Another important inspiration for this clock is the amazing series of “Hollow Clocks” designed by Shiura. I borrowed the drive gears from Hollow Clock 4 and revised the gear support design in order to decrease looseness in the turning axles. The electronics were borrowed from Hollow Clock V. Update December 2024: I designed an optional improved electronics board for the clock that has significantly greater timekeeping accuracy and causes no humming noise when the motor turns the clock hands. See end of these instructions for details. Problems or suggestions? Please see the tips and troubleshooting section at the end of this description. Or, l