@Steve Are we to use supports when printing the upper part of the weight shell? Or invert the shell with outer supports to hold it up? Whats the shooting solution here please? Support density? If you invert it, do you need supports for the base screw bosses on the inside? Cheers

@Steve I wonder if you ever saw a wagon spring clock. There are few ways to power a clock and printing leaf springs outta pla and stacking them may give you enough power for a nice desk or mantle clock. I have seen these wagon springs even made from wood. The photo below is a complex metal setup, but it doesnt have to be this complex. And I dont think you will need the cantilever system. You make your spring, then attach a cord to them and wind up that cord on the drum. You could anchor the spring in the center and have 2 cords going to the drum, One from each side of the spring. However getting past a 36 hour clock might be the issue. You would have to tinker some. Just some food for thought. Cheers