Securely mount your Arduino and Ramps board with this mounting plate. Tabs have tapered holes to accept #6 wood screws.
Drill the board mounting holes out with a 2.5mm drill and tap with an M3x0.5 tap. I used 1/2" nylon spacers between the Arduino board and the Ramps board. Be careful not to crush the tiny surface mount LED as it is right beside a mounting hole. I used a soldering iron to melt a relief into the spacer. Fasten to your box printer with #6 wood screws.