This is a RunOut Sensor for our Printer.

I use double-sided adhesive tape :) It uses a no-name optical endstop (like this one http://www.geeetech.com/images/v/Geeetech_IMG_5412.jpg) switch and just "guides" the filament threw it. Endstop is connected to a Raspberry Pi running Octoprint, which is handing the correct parking and resuming by using the Filament Sensor Plugin http://plugins.octoprint.org/plugins/filament_sensor . or the Filament Sensor Reloaded (i use it) http://plugins.octoprint.org/plugins/filament_sensor_reloaded

Connect the Voltage Cable to a 3V Pin from Raspberry. The ground to a GND Pin. The Signal to a free GPIO Pin. You see my connection on a picture and the setup for the plugin.

Works with all 1.75 mm filament (you should be able to drill it up to work with 3mm), except transparent ones.