Polybox spoolholder
thingiverse
I love my Polybox; but as other people have noticed: the spools tend to fall over. This support structure will fit into the bottom bays; underneath the rollers. The roll-bar will keep the the spool in place. The bar has two caps, one side fits more tightly then the other. This allows for easier removal. Result: spools still rest on the rolls, but will not fall over anymore.
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