Plug in a plug (Type M)

I made this design because in my kitchen I have one more appliance than I have plug in space. So, I decided to modify a normal (Type M) 3-prong-plug that I had lying around to allow another appliance to plug into (on top) of it. Theoretically you could endlessly stack these onto each other, and I don't know why this isn't a thing yet...

More likely than not, you won't be able to use exactly the same design as I have here - because plugs come in all different shapes and sizes, but at least there is something to work off of.

NOTE: The only thing I had to print was the "cover.stl". The remaining parts were all already part of the plug that I modified. I suggest you buy a similar plug and work around the shape it has. For the terminals on the inside I used parts from a old multi-plug I had lying around and a 9mm bullet casing for the earth pin... which i cut a slot into so it would part when pushing the top most plug into it.

Initially I wanted to make the plug as safe as can be, but it was just more effort than I was willing to put into it (i.e. making a revolving mechanism that works with a torsion spring to close the holes when nothing is plugged in) But because the pins I used on the inside cant be reached without a tool I didn't bother with it anymore.