Possible dangerous electrical issue... Please help.

[Mjolinor]

You need to either go and learn about voltage and electricity in general or you need to take it somewhere and have them look at it.

The measurements you are taking are totally meaningless and provide no information
You cannot have a positive AC voltage.
You should be measuring the resistance of things with the printer unplugged.
3% voltage drop on 120 is 116.8 volts or so.

As a general rule you cannot feel anything less than 50 volts, this is why telephone systems use 50 volts.
It is extremely rare for anything under 100 volts to cause death.
Just because your filament is not in a plastic tube does not mean you are not developing static. If plastic moves against anything at all then an exchange of electrons and ions will take place.

Is your DC negative rail connected to your house ground wire?
Does your house have an earth spike?
Is your house connected to a PME system?
Do neutral and ground connect together at your meter?