mechanical filament sensor

Dear all,

this thing is a filament-sensor. The micro-switch I used seemed larger as most others - after trying some of the other nice designs I decided to create my own to accomodate the larger switch.
I can recommend to use octoprint and use the plugin "Filament Sensor Reloaded". Please see here for useful installation-instructions:
https://github.com/kontakt/Octoprint-Filament-Reloaded

**Features**

- micro-switch gets clipped-in. no screws required
- in addition 2 screw-hols are a