The pendulum won't run more than about 1.3 rotations of the escapement. I reamed out the pendulum hole in the back, it seems the arbor through the back is clean. The gears all run smooth when assembled without the pallet. I don't know what is up...?
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The video helps considerably. It shows that the escapement has plenty of energy. It looks like the gears have low friction and should allow the clock to operate properly.
The issue might be with the pendulum. Bearings that are properly cleaned of grease should allow the pendulum to free swing for around 10-20 minutes with no additional energy supplied. So why does the pendulum lose enough amplitude for the clock to stop in less than a minute?
Run a pendulum free swing test by removing the escapement and measuring how long it takes for the pendulum amplitude to degrade from +/- 5 degrees down to a small amplitude of around +/- 0.1 degrees.
It does look like the spacers around the pallet and pendulum are too small. I will look into the design and update them if needed. In the meantime, add extra spacers or print new spacers with the Z height increased to fit. Most slicers allow splitting misc_spacers.stl into individual components so you can isolate the two spacers you need.