Optical Z-Limit Sensor

thingiverse

A revolutionary optical Z-Axis end stop sensor that is incredibly easy to build and adjust, has finally put an end to all my bed adhesion nightmares ! Apart from the printed components, you'll need to gather the following essentials: * 2 M3x50 Screws (these will serve as rails) * 1 M3 x 30 Screw (this will fine-tune the height adjustment) * 5 M3 Nuts (2 on each M3x50 to secure the spring in place, 1 for the height adjuster) * 2 4 X M3 Washers (to sandwich the springs snugly) * 2 Springs (with a diameter of approximately 3.5mm) * 2 M2 Screws + nuts (you can reuse those holding the existing Z-Axis Stop switch) * 1 1k Resistor (any value between 680ohm and 10k will work) Check out the detailed instructions at https://blog.johannfenech.com/?p=917 for a seamless assembly process.