Anet A8 Spool Bearing
thingiverse
The Anet A8 spool holder relies on an 8mm threaded rod as its central axis. Given that most spools feature a center hole measuring 2 1/4" (57.15 mm) in diameter, it becomes apparent that as the printer pulls on the filament, it must drag the spool across this axis, resulting in considerable friction. This can lead to substantial tension on the filament and torque on the extruder assembly, often causing a layer to become misaligned. This simple bearing dramatically reduces the filament's tension by providing a smooth surface for the spool to rotate around.
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