Generic metal bowden extruder filament guide

I bought a cheap generic bowden extruder very similar to [this](https://d5nkxbcmx4bo4.cloudfront.net/faceview/d5g/a3h/ig/ae/affimgs/az-large-4860736.jpg) and immediately grew incredibly annoyed because the filament stuck to the threads in the hole on the output side of the extruder.

So I created this little funnel thing with the same M6x1 threading as the pneumatic coupling and the same 2 mm inner diameter as the PTFE tubing.

This is the first iteration and it worked flawlessly for me.
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