K8200/3Drag Auto Bed Leveling with 8mm Proximity Switch

prusaprinters

<p>Correct bed leveling is essential for good prints - Marlin firmware now has this awesome feature of measuring the bed and automatically adjusting the Z axis when printing.<br>As this YouTube video demonstrates.</p><p>I had a small used 8mm inductive proximity sensor (<a href="https://www.digikey.com/en/products/detail/carlo-gavazzi-inc/IA08BSN40PC/8541482">IA08BSN40PC</a>) from an earlier project. It is compact, but I think, expensive from new...</p><p>The sensor will detect detect a metal bed (<strong>not</strong> glass, etc.) from approximately 3mm. It must be supplied with 6 - 36V and has an output just below the supply voltage.<br>Output must be converted to 3 - 5V before connected to the controller. This is done with two resistors and one zener diode as shown on the picture (before protected with shrink tube).</p><p>There are a lot of good guides to setup the firmware and activate the auto bed leveling feature. Tom's Guide has a good video explaining the setup.</p><p><i><strong>&gt;&gt; If you like it, please leave a like, rating or a tip... :)</strong></i></p><h3>Instructions</h3><p>Except for the sensor and electronics no extra mechanical parts are needed. Use the existing two M3 screws already in the extruder to mount the the printed part.</p><p>For Marlin firmware setup, search the web as there are a lot of good guides out there...</p><h3>Print Settings</h3><ul><li>0.20mm layer height, 15% infill</li><li>2 perimeters, 3 top and 2 bottom layers</li><li>No support needed</li></ul>