I just received two rolls of some really incredible looking dual color PLA filament that should make some great looking clock gears. The gears will change colors as they rotate.
Here is the same gear with different orientations.
It is a bit pricey at $37 for a 0.75kg spool. A typical clock will use about one half to one third of a roll.
Did you have any bed adhesion issues? I just got a roll of Quantum and have found it quite challenging to stick, although it was with some small parts (the McGuybeer articulated dragon). Finally got good stick with a brim.
That demo gear looks really good though.