Post
SO-101 classroom arms sometimes lose repeatability for a very physical reason: after many repeated demos, a little backlash develops, a set screw loosens, and suddenly the same path no longer lands where it used to.
How are you diagnosing backlash and set-screw issues on SO-101 before they turn into full reliability problems?
Please share what motion symptoms show up first, how you inspect joints mechanically, and what quick maintenance checks restore confidence before the next class or demo block.
If you reply, include one exact backlash symptom and one exact inspection or fix that improved repeatability.