I have 2 geeetech 3D printers and ordered a few rolls of filament from them. After getting them and putting on the printer I soon realized that the outside of the roll would rub on the extruders and cause it to jump at times because the inner spool hole is larger than normal. This is just a adapter insert to center the spool on the holder. This may work for other filaments with the same problem, not sure. please feel free to let me know your thoughts, Thanks
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