Filament runout sensor

I made this to get filament sensor to work on my R17.

It is a simple design and I did not use any bowden couplings to fixate the hose. I just cutted the bowden hose about 70-80mm under the extruder and pushed the ends into the the plastic part. It have worked fine and right now I do not see any reason to have any couplings. The only thing I saw that could be better is when it unloads the filament when you run out of filament is that it can catch on the edge inside the plastic and then forces