Quartz-movement based perpetual calendar clock

A 3D printed clock with a perpetual calendar mechanism that correctly handles all types of months, including February in a leap year, has been developed. Despite the weak torque of a quartz clock movement, an improved mechanism has been designed to mechanically realize this complicated function. Step-by-step assembly guide (video) at Explanation of the perpetual calendar mechanism (based on the former design) is at Instructions and the 3D data is available for free at :5980536