Tevo Tarantula Filament Runout Sensor & Dust Filter

I made this sensor from a [limit switch button](http://ali.pub/2pzbcz) I bought on AliExpress.
The task of this sensor is not only to stop printing when the plastic ends! He had to clean the plastic from dust and straighten the rod to make it easier to enter the bowden extruder.

**Just a small life hack**: if you are having problems when changing the plastic in the extruder that goes with the printer read below:
Buy the cheapest [M6 thermal barrier](http://ali.pub/2pzbqe) in China, cut o