If you are standing on the floor, you are grounded. Even if you are wearing shoes, you are probably still grounded. The resistance to ground is still very high, but a short through you at 110v to ground Is Not a Good Thing(tm) I think that SteveC just wants to make sure that we all stay safe. As fun as it is to work on the printer (or frustrating as in many cases) if we don't walk away from it safe and alive NONE of this matters. And all it takes is not thinking for one second. I'm an extra class ham and I'm used to working with very high voltages. But I know I've just had a momentary laps that later scares the *crap* out of me when I think about it. These same thoughts go with gun safety. All it takes is a momentary lapse and you have a tragic event. Please stay safe.