This little Anti Snag Bullet will prevent tightly wound filament from jamming and destroying your prints.

It works by lifting the filament away from the spool without jamming at all.

This has been thoroughly tested on a known over tightly wound spool of PLA which had previously caused multiple failures by jamming on the spool. This will also save your extruder from wearing out trying to pull the filament through.

Fitting:

Push the PTFE tube in until it stops, don't force it out the other end.