Weight Shell - Supports?

@Mike Snider I use 0.12mm elephants foot compensation. PrusaSlicer assumes it is a negative number. The intent is to create a perfectly vertical wall. A small fillet is OK too. I have tried adding fillets or chamfers for looks, but the shape is too complex for the procedure to complete.

A belt seems like it should have the same accuracy across the entire range of travel. I would prefer that the Y axis have two motors so the tray can't rack sideways.

It is great having other experienced clock experts look over the designs and give feedback. I have no formal training, but I do read a lot of clock design books and have a very structured approach to problem solving. I still keep finding better ways of building things.

I would love to see any new ideas for the pendulum hanger. If you post them, they have a possibility of making it into some of my clock designs. I have tested many different materials and small ball bearings were consistently near the top of the list. Printed knife edges were not good. Other designs with a rolling surface did quite well. Narrow gauge guitar strings make great suspension springs. I deliberately did not include traditional clock suspension springs because I try to design using relatively easy to find materials. It would have been good to test them as a standard reference.

Steve