Scrab filaments spool

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Usefull spool for very small quantity of filament.

I designed this spool because I had  spools with a small quantity of filament but I had necessity to refill with different color, then this spool have a bigger diameter of internal part andpossibility to add weight by AA battery to avoid problems in the AMS.
The spool has been succesfully AMS tested with 10mt of filament.