Generic Extruder Wheel
thingiverse
This is a generic extruder wheel that fits over a 5mm shaft with a flat. Makes loading the filament much easier as the filament is only aligned when the wheels are gripping. There's lots out there so this is just posted for completeness (and I had to reprint in "printer black" so why not post while I've got all the files at hand) Part of The Dark Night collection https://www.thingiverse.com/jshelley/collections/the-dark-night
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