cr10 runout sensor

Better CR10 filiment runout sensor holder. Minimizes switch travel distance so twisting of the filament doesn't mis-trigger it. Also has a longer lead in to align the filament. Attaches to the left lead screw nut. Uses three 3/4" #4-24 sheet metal screws to attach the top to the bottom and two 1/4" 4-24 sheet metal screws to attach the switch PCB. You can reuse the screws that hold together the stock run out sensor as longer screws to attached to the lead screw nut.