N20 gearmotor cotton reel adapter (6mm diameter)
thingiverse
Customized version of https://www.thingiverse.com/thing:2851617 Created with Customizer! https://www.thingiverse.com/apps/customizer/run?thing_id=2851617 This hub presses onto the shaft of the N20 gearmotor to adapt it to take a cotton thread spool using a common sewing bobbin with 6mm internal diameter hole. I found the fitting to be firm straight out of the printer, though if your particular bobbin is loose you can put the end of the thread through the centre for a firmer fit If you're in Australia, the bobbins I'm using are Semco metal bobbins, sold in a 12 pack at Spotlight about $3; though the quality of these things varies I reckon any generic bobbin (approx 10mm width) for sewing machine use will be fine. Also would be fine for any situation needing a 6mm diameter hub
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