Screwed bottle cap
thingiverse
Not a lot to say, just a bottle cap. Tinkercad design: https://www.tinkercad.com/things/hqDoH3Fl5Uh-screwed-bottle-cap I printer mine with PLA, 0.6mm nozzle, 0.2mm layer height, 45mm/s speed, with zig-zag support.
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