Defently check it out, buy yourself one of those cheap socket testers, you should never get shocked from anything you plug in.
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I wasn’t literally shocked, but you can get some leakage or induced current between appliances or grounds that is very unpleasant but not dangerous or unexpected.
A tingle or a shock from touching a case should NEVER happen. The case should not be energized. It shows that YOU are a better conductor than the wiring. Your outlets are wired incorrectly, or the device’s insulation is damaged, or a wire terminal is touching something metallic besides its intended connector. Even touching the heat bed should not produce a shock unless you actually have a finger on the wire terminal.
Since multiple devices produce a shock, the problem is most likely a fault in your house wiring. Besides being unpleasant, this is also a potential fire hazard. Get it fixed.
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Not to dissuade your point as it’s mostly and wholly accurate, but a static shock can occur from room generated static, in fact you want to feel that discharge as it means your device is properly grounded.
I would also refrain from stating you become a better conductor than the wiring in any circumstance. Electricity is keen on taking any path it wants, even if not logically the path of least resistance. Many, many people have found this out the hard way thinking they were smarter than the laws of physics somehow.
Just want to mentally prepare you for that outcome, it has caused grievous harm in the past underestimating that statement above.
Where there is potential, there will be an outcome someday, sometime, somewhere, somehow.
Nature finds a way.
I just started noticing this exact same thing with mine today. I replaced the nozzle assembly earlier today and now have been feeling the constant tingle of electricity when I touch anywhere on my case. I am going to check that all of my connections are good at the nozzle after this 12+ hour print that I’m 1/2 way through finishes. I notice that your comment was from 6 months ago. Did you figure out what was causing it on yours?
Not really. I have since then changed the nozzles and also moved the printer and currently it seems the issue is gone.
Get an outlet tester to eliminate the possibility that your outlet is not grounded. You can get a Klien RT110 outlet tester on Amazon for $10. Don’t test it with your body. LoL
1967??? California??? Well… there’s your answer right there. Everyone knows that everyone back then was tripping on acid and shrooms. 
Sorry… I just couldn’t help myself, that was just a perfect setup. 
Obviously there can be a dozen reasons why you may have a ground fault. If those outlets are as old as they look, why not just replace them to make sure they aren’t the cause? Matter of fact, it would be a good opportunity to add a GFI outlet to that circuit just to be sure. If it keeps tripping then you not only know its a wiring problem but it probably is a safety issue you didn’t know about and the printer just did you a favor by bringing it to your attention.
1967 might not even have grounded outlets. The NEC changed in 1962 to specify 3-prong grounded outlets but it wasn’t very strongly enforced. If the house was retrofitted with grounded outlets, there are many opportunities for that to have been done wrong. Especially since the original wiring probably wasn’t three-lead.
You should never draw any current when touching an appliance. A class-A residential GFCI will break the circuit with only 4-6mA of current flow. That’s not even enough juice to light up a LED. If you’re feeling electric current when you touch something, even if it doesn’t immediately electrocute you, it absolutely means you’ve got a wiring issue you should fix before touching that something again.
Why? You don’t know what the path to ground is. You could touch something else while in contact with the “leaky” appliance that provides a better ground path and suddenly instead of a few mA of leakage current you’ve got a few Amps flowing through you and you die.
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Same electrostatic discharge when i touch the plate after print.
It’s a big issue i think…The Ground connection to the earth of my house
are solid, i’ve double ceck the path from inside outlet to the printer,
no issues find…
In my opinion when printer move the x and y axis at high speed
the movement of belts around motor sprocket generate a
electrostatic charge…
Another suspect is friction of carbon Fiber rails in the head.
I try to made some tests.
If anyone have solve this issue please write here!
A properly grounded printer will not develop a static charge from the friction of any moving parts.
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Are you meaning a single (or two or three but not continuous) shock when touching the print or more likely removing the build plate from the machine? There isn’t much that can be done about that. The build plate is isolated from the printers ground by the magnetic surface that sticks the plate to the x axis and the fact that the plate is covered in a non conductive plastic. The triboelectric effect can cause a voltage differential to be generated between you and the plastic of the print and build plate surface. The result is a static shock. You would have to rig some sort of ionizer or a flexible grounding system like the little black brush you see at the exit of a laser printer. The ionizer will neutralize the charge while the grounding system will bleed it off.
If you are meaning a continuous shock while touching any metal part of the printer and a nearby grounded surface, then your outlet is not as grounded you think. Or your nearby grounded surface is in fact not grounded and you are being shocked by it.