I had a random idea the other day for your clocks. The idea is a clock that will chime every hour. The idea seems simple but the gears would probably be complex. I think it would be cool if it would play the Westminster quarter, the sound that big ben makes. This may be hard to design in a 3d printed clock, but it would be cool.
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If you have time, it still could be a good idea to make a file compatible with all your 3d printed clocks that would chime a bell. If not that is fine.