Bearing Filament Holder - Alfawise U30 Pro / Longer LK4 Pro
thingiverse
This is a filament spool holder designed on Longer LK4 pro, where the original model causes a significant amount of friction with the spool. With this upgrade, the problem of motor step loss is completely eliminated. To assemble it, I used two threaded rods measuring 3mm in diameter and 150mm long to reinforce the PLA. It's highly recommended to use nuts and washers for added stability. The bearings used are common and inexpensive 8 x 22 x 7 mm units.
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