If you're a Filawinder user, maybe you've experiment that if the produced filament,
isn't perfectly straight, when it goes through the PTFE tube, probably it will drag the
tube toward the spool, risking to break the servo. Infact the tube diameter is larger
than the servo arm slot. This tools, hardly screwed with the Filawinder basement,
will block the PTFE allowing only the passage of the filament to the spool.
Be careful, if the produced filament is too much twisted and curled, you risk to
damage the motor, but surely if not, you'll save the servo.http://www.thingiverse.com/thing:1465422
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