This is a holder which allows you to store up to 3 UK plugs, so that they are not dangling on the floor.
I have included a variant which has a slight incline, which ensures that the plugs stay in even if they slightly pull down, before the tolerance is pretty large.
You can use any material for this and it will work as expected, but PETG might ensure it is a bit more resilient if you plan to constantly take plus in and out of it.
The author remixed this model.
The model has been simplified to have a flat bottom, it includes 3 plugs instead of one, and a variant includes an incline so that the plugs do not slide out easily.