Filament Runout Sensor Mount / Filament Guide

thingiverse

This is a filament runout sensor mount / filament guide for the Ender 3. The original design by DynaMight1124 was attached to the Z lead screw slot near the extruder, but I found this made loading and unloading filament quite difficult. Combining this with the filament guide design by Filboyt allowed me to move the mount up and away from the extruder. This way, I could use it as a filament guide as well and because the mount placement doesn't change with the Z axis, it was easier for me to wire. There is a hole in the mount to pass the wire and a slot to attach a plastic cable tie (2.5mm width). I passed the wire through the profile slots and covered it with profile fillers. I used the cover hole for the Z stop switch to connect the wires to the motherboard. If a filament break occurs between the mount and the extruder, the sensor won't trigger so this might be a possible design flaw although I hope the filament guide part will prevent this. I've been using this for a few months now and so far it has worked perfectly. If you run into any problems, please let me know.