Anet A8 Push button guide

One of the minor issues with the A8 is that the 5 control push buttons wobble a little in the guide holes, sometimes resulting in a non functioning button press. A previous printable fix was made that you applied behind the acrylic face plate. Then in late 2016 / early 2017 Anet made the guide holes smaller, rendering the printed fix useless, whilst the smaller holes didn't actually fix the problem.
My solution effectively makes the buttons slightly thicker and eliminates the problem. The button caps rely on a friction fit. If like mine, one button is smaller by a fraction of a millimetre, I secured the button with a blob of Blu-tack (Tack-It, Plasti-tac, sticky-tac, presstik - the sticky blobby stuff you put posters up with as a kid).
Don't glue the button caps on, or you will never get the control circuit board off the acrylic face plate again.

The walls of the button are VERY thin and require a little finesse with the slicer. I used Cura 2.3.1 (settings below)

The nice thing