Simple filmanet runout sensor housing using a microswitch

thingiverse

This sensor housing is designed to hold a micro limit switch that is approx 6.5mm wide, 10.5mm, and up to 23mm long. I don't have a link to the switch I used, but I'd think it's a fairly standard size. Maybe it's not - let me know! The switch should have a rounded end of the paddle, otherwise retracts will probably scratch the filament and a filament change command could jam the filament over the paddle, which would probably just push the sensor out of the ptfe tube (if installed). I have a direct drive, but as I was writing this I thought about longer Bowden setups... this sensor would need to go upstream of the extruder motor. I don't have any mounting solutions, but it should still work fine. I use this such that the switch is connected to the Raspberry Pi running OctoPrint, and have the [Filament Sensor Simplified](https://github.com/luckyx182/Filament_sensor_simplified) plugin installed to manage the signal. This sensor also doesn't have fancy features like jam detection, but it will detect a runout - I have not had any false positives or fail-to-detects while using it.