Screw-down base support for Neje Master 2S

The original design was the one I liked best in here, for material amount and print time.
There are better ones for very tall objects to engrave, but I don't plan on working with those.
My peeves were the fact that both bases were the same size, while the side with the plugs is 9mm larger, and that neither had a closed receptacle, but they were open on one side... why?

I rapidly took care of these things in Tinkercad.