PTFE Lined Spool Holder and Filament Guide
thingiverse
Using ptfe to reduce drag as filament is pulled, spool holders and filament guides eliminate jams and underextrusion during print. They work smoothly with 5mm x 8mm hex screw and twist lock t-nuts in the 2020 extrusions, but you can also use 4mm screws and nuts for a reliable setup.
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