Filastruder Masterspool nut retention plug
thingiverse
I recently got the injection molded masterspool sold by Filastruder here (https://www.filastruder.com/products/masterspool-empty-spool) Upon using it, I found that the nuts had a tendency to fall out of their countersunk retentions causing difficulty in use. So I designed these plugs to secure the nuts in their countersunk retentions for ease of use.
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