Primarily created on geeetech prusa i3 series, this item is simple, this enables you to adjust and turn the screw by only one hand. I used the m3 rosette found here http://www.thingiverse.com/thing:6599 and still requires 2 hand to turn the screw and holding the nut in place especially when using a locknut. This thing probably fit on other platform as well, the measurement distance from the edge of the wall/pole to the center of the screw hole is 4.5mm Using this requires a spring loaded bed. This thing not tested yet, theoretically this should fit well without the wall breaking during the turning process. Please give me feedbackUpdate21.1.16