Spice Jar with O-Ring seal
thingiverse
This is a compact container that I use specifically for storing spices. It utilizes a widely available 47mm inside diameter x 3.5mm diameter o-ring (https://www.mcmaster.com/1302N632) to deliver a secure and tight closure system. Although I can't confirm the effectiveness of an airtight seal, I've found this setup to work surprisingly well.\r\nAt least three perimeters, generous top and bottom layers, and ample infill should help achieve a nearly airtight result.
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