Larger end stop for Kossel 2020 Ver 2.0

This is a slight modification to gnahz's end stop to correct spacing for the Makerbot End Stop board. I also deleted the holes for the mechanical switch.

The second version (2b) is for the Sintron Kossel. It requires an M3X12 flat head screw for mounting. The microswitch board requires two pretty short screws. I used M3X6.