A screw adjustable z axis end stop for the Folgertech Prusa i3. Allows for easier adjustment of the z-axis.The micro switch .stl mounts to the z-axis motor. Remove the 3 screws, 2 that hold the motor, 1 that holds the motor mount. You will need 3mm longer screws. Mount the micro-switch to the top holes. You should not need any nuts on the back end. The screw mount .stl mounts to the x-axis motor. Remove two screws towards the inside of the motor and replace with longer screws. Use any 3mm screw (3x12 should be enough) for the adjustment screw. This should thread into the plastic, no nut required. All screw hardware is 3mm.