expandable loose filament spool with holes for skate/bearing/roller holders
Description
This is a remix of [https://www.thingiverse.com/thing:2413914] that uses holes in the middle of the spool to hold the start of the filament in place. Keep in mind, that this only works if you put the spool on a skate/bearing/roller filament holder that does not hold the spool through its middle, since there are the filament ends sticking out. For the loose end of the filament, I highly recommend these clips, since they keep the filament inside its filament "chamber": [https://www.thingiverse.com/thing:4702208]
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