I created this mounting bracket to hold my RAMPS 1.4 controller. I used cable ties to hold the Arduino to the mount and then used screws to hold the mount to a piece of 1/8" hardboard that was connected to the A-frame of my Prusa I2 with the included clips. Just one word of caution - don't cut the hardboard too wide or it might interfere with reaching your printers max height. I have included Parasolid files and SolidWorks 2014 part files.