After working with EZ Robot servos for 3 years, I finally saw smoke, although it looked white.
The magic was how fast it developed.
I found the problem, and it was me!
The manual movement test was ok for clearance, but not enough clearance on a new trial test, with multiple servos active, on one of my robots.
It was one of my HD servos.
I do not think there would be time for a safety to respond, because it happened so quick.
You do not learn unless you attempt new ideas.
I am still building, learning, and enjoying EZ Robot!