Exhibition

The exhibition stared and the clock worked for 5 minutes (or less).

Replaced it with a sign "Exhibit down for repairs" and tried a whole day to make it run reliably. It did so. Hung it up again, and it failed in a totally new way. It now just twitches in an unpredictable way

"Reboot"

I've had other things on my plate last week, so it just had to be that way. This weekend I have purchased parts for 3 more clocks. Tweaked the 3D design with more clearance, thicker plates that do not warp and such like. New motors with drivers to match, not soldering a shield. 

It fails the same way, meaning each component test is 100% but the total assembly doesn't work. Either something subtly jams or the "load" on the motors of an arm is too much.

Waiting for inspiration to strike....