Spider Effector System Microswitch Probe

Attachment for microswitch probe to Kossel adaptation of Universal Effector System: https://www.thingiverse.com/thing:6831701.

Parts required:
* 2x20mm nail to act as probe pin (grind/round the tip before use and sand any rough parts to make nail slide freely and fall down on it's own weight when released)
* small microswitch (distance between mounting holes around 6.5mm, remove metal lever)
* 2xM2 bolts with nuts to mount the microswitch (maybe two pieces of filament heated and squeezed to fill excess play would also work :) )

Previous probe mounted on the edge of effector had too much location bias, this one became usable for bed levelling.