Simple refill coil replacement

Have you ever had to throw away filament because the spool unraveled while you were putting it in the spool holder? It happened to me. To be precise, the first time I had to open a spool, a third of the remaining filament went to waste, because it was so tangled. With this accessory, it will never happen again.

Remove one side of the spool holder, insert this and lock it with the hexagonal. Bring it under and then remove the remaining half of the spool holder.