3D Printed Perpetual Calendar Clock Ver. 2

A Clock with a Perpetual Calendar Mechanism

This clock features a perpetual calendar mechanism that correctly handles all month lengths, including February in leap years. Despite the limited torque of a standard quartz clock movement, a simple yet ingenious mechanical design enables this complex function.

Numerous improvements have been made over Version 1. The drive gear train from the hour hand to the main cam is now concealed behind the front panel—not only for aesthetic reasons, but also to minimize the gap between the clock hands and the index markings.

Features:

• The calendar advances automatically, requiring no manual adjustment until March 2100.
• Powered by a commercially available battery-operated quartz movement, it runs for extended periods without an external power supply.
• The calendar can be easily adjusted by manually rotating the clock hands.
• The flat rear surface allows the clock to hang neatly and flush against a wall.
• A skeleton design reveals the internal mechanism, making assembly straightforward and visually engaging.
• No screw heads are visible from the front, contributing to a clean appearance.
• All parts are designed for easy 3D printing without the need for support structures.
• A visually appealing finish is achieved using multi-material 3D printing.
• The calendar sub-dial hands (day, month, day of the week, and 24-hour) are aligned in height with the front panel, preventing any visual offset when viewed from an angle.
• The main clock hands (hour, minute, and second) are also positioned close to the front panel, and the standard hands that come with the movement can now be used.

Face plate for the other languages are at https://www.thingiverse.com/thing:7010081

Some parts are carried over from ver.1, but the assembly process is completely different. Therefore I upload this clock model as an independent thing.

Apr 22nd, 2025 : Models for standard size printers such as Prusa MK3S (210 x 210mm build plate) and minimum version (200 x 200mm) are added.

If you build this clock, please share your work by posting it as "Post a make" here to encourage others!