M3D Filament Spool Spacer (12mm)
thingiverse
Designed specifically for a spool holder and 12mm diameter tube: https://www.thingiverse.com/thing/731318 \n\n \n\n Instructions:\nThe Sample was printed with Medium/Medium settings without a raft. \nFirst, insert the spacer into your filament spool, then press it onto the holder tube. The tube keeps the spacer taut to ensure a perfect fit.
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