Magnetic stir bar (bean)
thingiverse
My first thing! You are better off purchasing a teflon stir-bar, but this will work in an emergency. Size: 1 cm x 2.75 cm Magnet holes: 1.75 mm depth, 8.5 mm diameter (requires two 3 x 8 mm neodymium magnets) The extra space in the holes allows for errors and glue required to glue the two halves together. This is not suitable for chemicals that will react with your filament (or the glue you choose to use). The file only has 1 half of the stir-bean, make sure you print both.
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