Cherry MX fillament runout sensor

I created a filament runout sensor that uses cherry MX switch.

It consists of 2 parts "keycap" and casing. You'll also need any cherry mx style switch and a cable to connect the sensor to the mainboard.

I used tiny drops of super glue in the corners of the switch. You may also need to sand the keycap round, because the filament does not slide in smoothly otherwise.

I still haven't completely figured out the mounting for the sensor.