Just a note to say that my 21 day, large skeleton clock is working fine at the moment. I had to take the pendulum bearings out and soak them again, but now it runs like a champ.
My only problem is that the clicks don't fit in the rachet very well (they seem to be too big) and it is quite hard to wind the clock. I printed them from the same clock file and am using the 10 day ratchet option. I now have three sets as I reprinted some more thinking they might be smaller.
I am very happy with how the clock runs and might do another one.