Ender 3 / Pro control panel SD reader

Discrete control panel mounted SD card reader that is easy to see and access.
It is a mount for a micro SD- SD card extension cable that places the SD card slot at the top of the control panel. I have designed it to be compatible with the display board rear covers such as https://www.thingiverse.com/thing:3019402.

Designed to fit without screws by removing the top rail and gantry, then sliding down the T slots from the top. This gives a very solid mounting. Note the tightness of fit does depend on the printing orientation. If printed upright as I did, the layers are at 90 degrees to the T-slot features, and this makes them more difficult to slide into the T-slots. I gave these a light sand to smooth out the tiny ridges between layers to allow an easier fit into the T-slots.I wanted a quite firm fit.
If this thing is printed so that the layers run along the length of the T-slot features the fit will be easier. This will require supports.

I ran the ribbon cable in a cable guide a