Model originally uploaded to Thingiverse at https://www.thingiverse.com/thing:4767133.

<p>This is a ball bearing, hall effect, filament runout sensor. I am using a o-ring for the spring to close the switch if the filament runs out. The sensor triggers low (ground) when there is no filament in the sensor. The led is on if there is no filament in the sensor. This will work on either 5v or 3.3v. The led is slightly dimmer if used on a 3.3 volt system.</p> <p>There are 3 different bodies for this sensor</p> <ul> <li><p>One with built in stops for the ptfe tube.</li></p> <li><p>Without stops for the ptfe tubing. (Custom cut the tube around the bearings)</li></p> <li><p>One for use with ptfe tube locks.</li>,/p> </ul> <p>If you have any questions or suggestions please let me know.</p> <p>Kevin</p>