Filament holder for bowden extruder

I've created this design because sometimes the teflon nozzle feed tube escapes from the pneumatic straight fitting. I possibly will use it while I buy a new pneumatic straight fitting.
At the moment the problem was solved, the pipe does not escape, and it does not spoils my 3D impressions, using this holder.

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Well, it is a little embarrassing for me, but... If you like my designs, please think about donate on my PayPal -> onasiis@gmail.