This is a mounting base for a lid/cover switch to be used with a cheap chinese K40 laser to get a little bit more safety. :-)
You can use glue or double sided tape to fix the mount on the K40 chassis - no need to drill!
Use two M3 hex screws with nuts to attach the micro switch.
The horizontol space between the screw holes (center to center) is 22mm, the vertical space is 11mm.
Print as L form with the screw holes on the build plate.
I used this micro switch: