Arduino Mega + RAMPS mount bracket

This is a mount bracket for Arduino Mega with RAMPS, but should work with other shields too. It is intended to be mounted to a 2020 extrusion, I mounted it to my Kossel underneath the print bed. M3 threads are needed to be tapped to the Arduino mount holes. It is necessary to install the bracket first to the extrusion and only then install the Arduino with one screw and last RAMPS with three screws through the Arduino mount holes.