This thing prevents your plastic filament from flopping over the side of your spool, wrapping itself around your spool holder, getting tangled, and stopping your prints prematurely. It is designed to work with Octave brand spools of 1.75 mm plastic filament.

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1. print with all default settings on ReplicatorG; 10% fill, 0.27 mm layer height, 1 shell, 41 mm/s feedrate, 56 travel feedrate, 220 C print temperature, raftless and acceleration on.

2. pop on to your spool.

3. enjoy tangle-free filament printing!