Stronger_Kossel_Carriage_with_integrated_belt_clips_for_open_belts+Optical_End_Stops
I remixed the "Stronger Kossel Carriage" (http://www.thingiverse.com/thing:969333) and added Optical end-stop tails.
This thing was made with Tinkercad. Edit it online https://www.tinkercad.com/things/am4vQLjVfeW