Filament sensor

I found lots of other filament sensors that had no consideration for where they should be mounted so I designed my own that sits nicely on an extruder.
It uses this switch: https://www.ebay.co.uk/itm/Long-Hinge-Lever-AC-125V-1A-1NO-1NC-Momentary-SPDT-3-Pins-Micro-Switches/183968686147?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2057872.m2749.l2649