the WHEEL - TWO SIDED - Ender 3 loose, unspooled filament protector, guide
thingiverse
It won't function with TPU! Print test small objects first and verify if they fit on your axis - if not, adjust the scale in the slicer slightly. This method is suitable for a small amount of unspooled filament. It works because of PLA, PETG, etc., filament stiffness - the filament maintains its spool-like radius by itself - no need for a full-size spool axis diameter adapter - the diameter of the original Ender 3 filament axis is sufficient. Use only under adult supervision! https://youtu.be/SPHoJ2gNPfk
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