Printable Clock, Parametric Proof of Concept

Another proof of concept along the way to a WORKING printable clock. A working clock would, for example, have a case. :-)

Aside from such petty concerns, this clock is complete, in that we have a power source (a drum to wind a string and weight), a whole gear train (5/3/2/2/5/3/2/2), a Graham escapement, a (token) pendulum and three hands mounted on concentric shafts to show the time.

It is fully parametric, animate-able, and about as modular as I could make it within the current constraints of OpenSCAD (recursion would be nice for the eight gears in the gear train!).

The code uses three different types of gear wheels, each able to support any level of nested concentric shafts if needed for support or to run clock hands:
1. A drum with an outer gear along one rim,
2. A pinion wheel with a gear supporting a smaller gear,
3. An escapement wheel supporting a smaller gear.

It also automatically positions them relative to each other, ensures that they mesh properly and rotat