This is a minimalistic rod-mount for your printrbot electronics. Simply use 4 zipties to mount the board onto your M8 threaded rods. No screws needed.The STL file is configured to fit onto the original Printrboard Electronics board ( http://printrbot.com/shop/printrboard-electronics/ ) but you can change the parameters in the scad file to attach other dimensions too....UPDATE:TIP: It's even better to mount the board upside down on the upper rods, so you have better access to the connectors, especially the power-cable connector.For the Sanguinololu use the outer and the inner holes. For the Printrboard use the outer and the middle holes.If you need this mount with other dimensions ( other rod diameter , another mount hole distance, more flesh around the rods, ... ) you can edit all these parameters in the scad file.Enjoy !