This anti-backlash z axis nut trap replaced the wooden nut traps that are used for the z axis of the MakerFarm Prusa i3v. I had a lot of trouble with my z axis where one of the nuts would walk out of the wooden nut trap causing my machine to go out of calibration. Once I replaced this part my z-axis homing and positioning has become extremely reliable. This design is for a M5 nut that comes with the Prusa i3v.To install this part you will need to disconnect the z axis motors from the threaded rod. Once the threaded rod is disconnected the nut trap can be guided up into position. Once installed the z-axis nut will no longer be visible. It will be trapped between the new z-axis nut trap and the existing wooden z axis guide.