I have been working on a clock that could run for 8 days
I designed an efficient escapement with 1 mm steel pinson the anchor and 3 D printed escape wheel
The gear ratio is 1/8 x 1/5 x 1/5 x 1/5 = 1/875
With a 50 mm drum and a pulley I get an 8 day power reserve with a little over 1 meter of drop of a 3.5 kg weight
STL Files here:
https://www.myminifactory.com/object/3d-print-clock8-280569
More details to follow
Stay tune