[engunneer]

Another inspector here. The thing I usually do is to touch (gently) every edge and corner that I can get to easily. anywhere i think a student might try to lift the robot from or under the robot where you might try to find the screw you dropped. If there is any edge that makes me want to pull my hand back, then that edge needs something. often filing can do it, but for sheet metal it's often sufficient to use a strip of electrical tape the long way on the edge to soften it, sometimes a few layers. attaching split pneumatic tube (with zip ties if possible) is another option mentioned above that is ok. be careful splitting the tube the long way though. The safety inspectors are watching.

I also touch every zip tie i can find, even if clipped, they can often be sharp, so a careful clipping is often needed to prevent scratches.