The motor-cooling fan seems a bit vulnerable to me. It sits on the aft side of the body and it has no protective cage on it. Granted, it's blowing out, so there is no danger of chopped off fingers, but it's just so open. I was wiping down my bike once and I actually did end up with the towel stopping the fan - accidentally.
I'm more concerned about something falling on or into the blades and breaking them, than my own safety.
I just wondered if anyone else has thought about this or even fashioned their own fan cage.