This is an easy to build 3D printed clock that has runtimes of up to 32 days.

The initial design goal was to simplify the bill of materials to make it easy to acquire the non-printed parts. These changes made the clock very efficient and it has 32 days of runtime using only 5kg of weight. Options for shorter runtimes would need much less weight.

The first design shown is available at https://www.myminifactory.com/object/...

The large version of the clock seen in the second half of the video is available at https://www.myminifactory.com/object/... The larger gear size take more energy so the runtime is limited to 21.5 days.

Assembly videos for both clocks should be available soon.

The complete bill of materials to build either clock is:
0.85kg PLA for small clock, 1.2kg PLA for large clock
25 6x3/4" wood screws
18" 3mm metal rod
9" 1.5mm or 1/16" metal rod
12' fishing line
5-10 lb. BBs or lead shot for the weight shell
5 623RS (3x10x4mm) bearings
4 springs from a ball point pen
44 pennies for the pendulum bob

Related videos:
Assembly part 1, basic components    • EZ Build Clock Assembly Part1 Components  
Assembly part 2, final assembly    • EZ Build Clock Assembly Part2 Adding ...  
Debug steps    • EZ Build Clock Debug Process  

Steve