Ender 3 Pro - Spool Plug
thingiverse
This is a plug that snugly slots into the end of the standard filament holder to help provide some resistance and prevent the spool for sliding off and causing damage to the printer below. The plug will slot in and will be held on with nothing but friction. If you are worried you could glue it into the tube as well. Please take note of the print settings carefully.
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