Worked well for me as well; visually it does seem to be an improvement in rotating the spool. Also shrank to 97% to fit Polymaker spools. Thanks for sharing the design. (edited)
Cardboard Spool Protector (inside) - Extrudr Filament - Solvespace
Protector is designed for carton spools of Extrudr Filament to avoid dust and debris from turning on inside spool holder
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updated January 14, 2022
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Seems to work great. Was a bit to tight for my spools so I had to shrink to about 97%
