Filament runout sensor for reverse bowden

prusaprinters

<p>This is a filament run-out sensor designed to be inserted on a reverse bowden setup (on the feed-in tube to the extruder).</p><p>I designed it for my Muldex 3D printer.<br>Details about the printer: <a href="https://github.com/3dprintingworld/MULDEX">https://github.com/3dprintingworld/MULDEX</a></p><p>Edit: The “standard” body is designed for 2mm inner diameter tubing. I added a variant for 3mm ones. The outer diameter should be 4mm in both cases.</p><p>Edit 18/12/2021: I got a few false triggering events on the “3mm” body version, so I moved the sensor placement 0.2mm up in the body.</p><p>Other hardware I used:</p><ul><li>a Panasonic AV38523 switch</li><li>2 PC4-M10 pneumatic fittings</li></ul>