Extruder Filament Runout Sensor (Ender 3V3/Plus, K1 Series)

See Henlors post for the BOM. A few changes made though are using an M2 screw and nut (the nut is designed to be a tight fit) rather than a tapping M2. The other was I just used a generic switch from Aliexpress that was 1A 125V and had a 10.5mm lever. I made this version because on the original one that used a nut and bolt, the PTFE coupler kept snapping on me so I made it wider and have not had any issues, although it does cause a little cracking when inserted, but I didn't want to spend anymore filament as it didn't snap entirely. Printed without supports, in ASA at 40% infill 4 Walls Note in the image the screw is on the outside only because I have yet to put the switch in on this one and it was easier to store the screw that way.