This is a decora style plate with a 19mm hole to fit a push button. It is based on an existing plate that I already had. It's an exact replica except for the size of the hole.
I will probably redesign it to optimize it for 3d printing.
I also uploaded a blank version here: https://www.thingiverse.com/thing:2794581
Print front face on the print bed to have a smooth finish on the exposed side.
Use support for the top and bottom wings.
The button hole is actually 19.05mm, it's really tight. It may need a bit of sanding, I was able to fit the button in it though.